As for my own take on this issue,
I have noticed with my use of Steam that the usual thing to do is run the Steam client (perhaps at system startup if you so wish) with the purpose of establishing a connection to Steam's servers and so access most of the features the platform provides. As is often the case when my system starts up because I use a not-so-good wifi card, Steam has trouble on its first attempt so I am frequently presented with the "What to do - retry or go offline" dialogue box.
To me, the offline mode only seemed to be "in effect"
after the client succeeded or failed in its attempt to contact a Steam server. For this purpose I did not personally see any apparent contradiction.
However when we examine the technicalities of the posts made by 2K Elizabeth and perhaps also Valve employees, we see there are inconsistencies (albeit small ones!) about the exact function of offline mode.
I absolutely agree that Steam is primarily a platform designed for people who have a mostly on internet connection. That is a completely reasonable thing for Valve to do and I would be surprised if they tried to cater roughly half-half for those who want online and those who want offline Steam for their computers.
The inconsistencies in statements, as I said, are quite small but they are there. If you think they are not very important then say so. There's nothing unreasonable about holding that opinion. However I think it would show a lot more respect if you avoided calling those who did consider these to be of a bit more important as irrationally paranoid or as Senethro put it, "trying to prove Steam is evil". That sort of commentary just turns what is basically a non argument into a constant argument of poorly read posts and poorly considered replies.
Personally the only negative experience I've had so far with Steam's offline mode is the instance where my internet connection failed around the time Steam needed to update itself and I was temporarily locked out of Steam until an internet connection could be established again. This is a real problem, but one that understandably many people are able to shrug off as minor.
I would imagine this particular "hung update" problem has something to do with the recent discussion about what exactly happens when the Steam client is first run by the user. If it was truly able to start up completely offline then I fail to see why something as simple as not being able to download an update should make the program completely unusable and unresponsive.
I am not at all surprised to see that Steam attempts to contact server/s when it starts up but that is because it is what it has looked like when I've been using it. I agree with ori that I think it's important 2K should be a tad clearer about the function of Steam's offline mode. Not many people would ever find out about it and most probably will not care but it's not the point. If they know the Steam system better than we do, which hopefully they do if they have a strong business relationship with Valve, then it would be reasonable to expect the information coming from them is accurate and not misleading, even if it is on minor details.
In reality I'd imagine 2K Elizabeth simply did not know about the fact that is under inspection in the recent discussion - that Steam briefly contacts servers even when starting up in offline mode. However it's not beyond her to find out a bit more about this. Only good can come of learning more about the system that is to be used for civ5, both for its fans and the publisher 2K.
It's tedious nit picking.
To think that a company (selected at random, based on no previous history or evidence what so ever) is going to do something illegal if you give it access to your system is paranoid.
That's all it is. Baseless paranoia.
Sure, you can have a problem with me saying that. You see that thing people dig up their gardens with? It's called a spade.
Please, show me where ori suggested a company (e.g. Valve) is going to do something illegal. He was very clear in expressing that he doesn't actually have a problem with the data they are likely collecting (if any), only that they are a bit misleading in their statements about how Steam functions while in offline mode.