Well, I'm not one of the developers, just a player, so I'm just barely scratching at the surface of some of the recent massive updates. But I can say that a lot of the things you mentioned are covered under the stated changes of the K-mod, etc. Whether or not they actually are relies on testing.
However, this one caught my eye:
12. Rome
as AI, NEVER sent a single unit towards france region, south of alps. not even a scout. anything wrong with ai tracking?. its as the AI think its impassable..
great civ, only strong human french, hindered them in taking europe starting with germany.
This one might actually have to do with the barb units separating the French, German, and Roman regions. I once got a Worker stuck in a loop because the barbarian forts were invisible in the fog of war, so they'd move to go through them, move next to them, see them, then start to go around, which made them lost in fog of war, and then the AI thinks "hey this other way is much shorter", goes back to the square next to the barb fort, sees it, decides to go around, repeat.
I noticed after like 2 turns, manually told the worker to go around using shift clicks, and then restarted the automation later. I don't have a save of it as far as I know, but I will keep an eye out for this happening again. It mostly fixes itself as soon as the civs spread out, as the cultural borders lift the fog of war, or AI Spain launches the Euroconquista against all Barbarian forts in Europe on it's way to destroying France and Germany...
As to some of your other points:
(Overarching note: Whenever we discuss AI performance with a certain Civ, we first must agree there is randomness in Civ4. Also, a sample size of 10 games in which Civ X was weak is not 100% proof that something is wrong, especially when the player is in the area. We tend to be a lot smarter than them. Also, I have noticed that different civs perform much differently on different difficulty levels. Something to keep in mind if we have significant differences in how a civ performs.)
4. Babylon.
I think that's WAD. It's been awhile since I played in that region, other than sending stacks through conquering anything that wasn't my color, but other non-playable civs are capable of building settlers.
5. India. Hmmm, yes. Kinda. I haven't played since Transoxiana was added though. I just saw AI India get their capital conquered in r4544 by them. Then again, it's hard to really say a civ is too easy for the player, I mean I can conquer all of Europe besides Spain as France before I even discover Iron Working on Emperor level. And by Conquer I mean have a few select cities while everyone else is smoking ruins. Peace is a desert, and all that.
6. Yeah, England has always been... odd. The AI has never been very good at sea based nations (look at poor Austronesia). I'm hoping some of the k-mod stuff will improve this.
7. Armenia
I've usually seen these guys do very well in recent revisions.
8. I can't say much about Japan except to say that I've never seen them conquered by the AI. Again, AI has never been good with naval stuff. I don't consider any games in which I have actually played in Asia to be a good example of their behavior since my human actions are generally much superior to anything the naval AI can do.
9. Barbarian forts
Less cities have these now, they are not in every barb city. Also, I regularly see Spain overrun the noncity ones on their north border with stacks before or around the medieval period. I haven't played long enough to tell if the AI has been improved with k-mod to do less suicidal tactics. Also, I have also massively improved my Civ4 play so I rarely have any local AI opponents by the time I reach Classical... So that means there's also less AIs to get bored with their spare units.
10 inca
I think this is WAD. They didn't do so well in our timeline either...
11. France
First, "Survive the first Netherlands attack"? What are the Netherlands? Do you mean that free city just to to north of Paris guarded by a couple of Warriors? I jest I jest.
France is another one of the civs that looks to be greatly impacted by the difficulty level. I usually see them get overrun by Spain, but I'm not sure if that's France's fault so much as Spain just building doomstacks to get rid of the barb forts and then needing something else to go beat up.
Also, Vassals have recently been reworked, haven't gotten a game to that tech yet since the nerf, but a recent dev post stated they got rid of the happiness bonus from vassals. Or maybe it was in the log of the SVN. Anyways, no more happiness cities with 40+ happiness right after feudalism.
13. portugal.
I think this one is 50/50. Portugal usually gets conquered in the end, but depending on difficulty level and luck, they hold off longer or shorter. I actually wish they were stronger to Spain didn't curbstomp Europe like they do in so many of my games.