The timeframe and forum makes it fair to characterize this as his current, considered, strongly-held opinion. That has bearing on whether we consider this a situation of "we disinvited him because we don't want our PR handled by people currently advancing opinions contra political sensitive aspects of our university admissions policy" vs. "we disinvite everyone who made a cringeworthy analogy to the Third Reich" (Mounk's characterization).
You have moved the goalposts immensely from "is Mounk's conclusion about Nazi comparisons accurate?" to "do you have proof from the horses's mouth that MIT would not have done this had he written this 5 years ago?"
You brought up timeframe (and many other conditions) as a rebuttal to the author. I'm just pointing out that you can't be sure that any of those considerations even entered the minds of MIT's admins. I hope we can at least agree that this opaqueness is an issue and could inspire future, less-careful censors.
If you're taking a position of absolute radical skepticism, you should be asking the same questions of Mounk's claim to know MIT's exact conditions, not using such hearsay as your own argument's starting point.
