Tim of the Oak quite neatly summed up my responses to your assertions here, but I will expound upon what he said for me. The difference is that the Bayern side Pep inherited almost 3 years ago are better than City are now. Certainly they weren't the defensive shambles we are now, but they also weren't fantastically over-reliant on a single striker as we are too.
The Bayern team Pep took over only shed Tymoschuk (due to age), Gomez and Gustavo, and none of them had played more than about 30 games for a team which had clocked up 54 matches the previous year. The other players they let go were basically reserve team players. To replace them, he basically brought in Gotze and Thiago.
By contrast, depending on which source you read, the press are saying Pep plans on making between eight and a dozen signings to completely reboot our entire squad. Additionally, the team Pep took over in Munich had come off the back of winning a treble. We come off the back of probably having thrown away a quadruple to win nothing. Maybe a League Cup, but we're not winning anything else. The Bayern players Pep took over had reason to believe they might keep their places whereas it's very obvious ours that some of our squad has between a 0 and 0.1% chance of staying, and a half-dozen others will only stay if we run out of money to replace them (FFP and all that) or if the squad harmony is falling too low from the sheer volume of new signings.
MP didn't "inadvertently let it slip out". It wasn't a "if I'm still here next season, I will...oh wait, did I said "if"?" moment, it was a very deliberate "before I finish, I will tell you that I talked with the club and...". He absolutely meant to say that, and I don't think any of us can criticise Pellegrini for speaking out of line regardless of everyone's individual thoughts on him, so I just can't see that he let it out just to get it off his chest. If it sounded impromptu then I would argue that sometimes when you go into a meeting of some sort knowing you need to say one thing but you can't say it until the end then this exact type of thing tends to happen - you lose track of what you were going to say and then just as everyone starts to dismiss you can catch yourself and have to do a "oh by the way, one last thing" type comment. That is exactly what happened here.
If you believe the MEN they did an interesting article on the timeline of the whole process and said that the club offered Pellegrini the choice on how to break the news and when, and he said that he wanted to release it himself. This makes sense because any other way that it could've happened would make it sound like we had left him out of the process entirely, which would look bad on him even if it would admittedly look worse on the club. I think that this statement was entirely planned and everyone involved knew it was coming.