It's all just conjecture. But bear in mind the fragmented production environment of the 2021 models.
It is equally likely that the re-engineered version is perfectly fine, but a batch of bolts weren't heat treated correctly causing them to fail. Or that the anecdotal evidence from the people who've experienced the problem was misstated so as to cover their ass for their own negligence. Or, an engineer seeking a bonus found a way to save a few bucks but screwed up a simulation/math. Or a supplier had Covid issues which forced a quick change.
Until you see dozens of these fail, it's hard to come to a conclusion. But, when you look at the amount of money it takes to correct the ensuing assembly failures, it's hard for me to believe that Ford did this for some nefarious purpose.
However, if you have a single bolt diff and someone engineers a solution for it, good for them.