I highly doubt they’d do it this blatantly if they were not confident this is an easy sell

I mean, I would have agreed with you, except we've also just recently seen even more blatant and indefensible union-busting from Rockstar in the UK, another country with good labour laws, and another country with more than adequate legal resources.

I think you're probably right that Ubisoft has sufficient legal cover to win this case, but that's because of the merits of this case, not because a big company from a country with good laws could never do something stupidly illegal.