yeah these are the parts I wanted to rewatch. Carl did take Bastions increasing the city strength of that border city Hungary was threatening, and he spread Islam to that border city adding another +10 strength on top of the +6 strength from Bastions.
As for Obuda, this appears to be just bad troop movements by the AI (no surprise there), but don't discount how powerful Ibrahim is. That's a massive bonus. People were saying the Ottomans weren't that good. +10 is massive.
I didn't quote the other quote about him using battering ram. Sadly the catapults even with increased strength just aren't cutting it. Too bad he didn't have bombards. Still, they weren't completely ineffective either. I just wish Carl had protected them better.
The AI was pretty bad there. They had a bunch of troops around, had the element of surprise (of at least a couple turns before Carl got Janisaries online), but yet still basically did nothing. You'd think they could have at least taken out a couple units early, enough that Carl wouldn't have had such an easy time going after a city which should have been pretty well defended.