Image generated by Online Art Critic (Terry Towery, 1997)
Online exhibitions are nothing new—here's Oliver Laric's incomplete timeline of the form from 2013 (he created this when ARTPLUS called theirs "the first exclusively online biennial exhibition of contemporary art" lol.) And yet reviews of these undertakings remain few and far between, not least at the highest echelons, in the pages of industry publications like Artforum and newspapers like the New York Times.
Notice that I'm speaking about (art) reviews particularly: focused critical writing that takes a qualitative position on an exhibition. Features—writing that points at something happening, or critically reports broader topics and trends—are more common. Here's a feature about an online exhibition in the Times from 2002. Here's a feature noting another online exhibition in Artforum from 2015.