Well, in my opinion "breaking" something means it cannot actually be done and be used. The patch made leveling careers much more time consuming, agreed. That does not mean it's broken. It's harder and more challenging.
It may have been more appropriate to say that
I think it's broken. Because I don't know for sure, of course. I would propose that it is possible to nerf something so harshly, out of proportion to the rest of the game, that it could be considered broken.
But... I do think that in my save file for this challenge, my sim's career progress is broken. I had noticed it was harder to level careers on my regular save file, but I don't think it was quite this hard.
Either way, I have PMed you all with more details, not at all sure what would be too much info here in the tourney forums.