Agreed with a bulk of what you've said in this article, and it's good that there's a clear term ("performative allyship") to identify such behavior.

One potential counterpoint: are there instances when "calling out other white people" can become a form of "performative allyship" in and of itself? That is, people (calling themselves "allies") who use social media as a venue to point fingers at White friends/acquaintances -- largely BECAUSE they are engaging in the gratuitous behavior to "prove" and show off how #Woke they are, for others?

When it's being done so that the purported "ally" can make themselves feel morally-superior or productive -- rather than combating actual racist speech -- that would seem to be an emblematic definition of "performative allyship," wouldn't it? In my observations, many of these so-called "allies" are using virtue-signaling, thought-policing, and academic elitism to "call out" anybody who remotely disagrees with them insofar as the nuances of various topics within Critical Race Theory.