He obviously knows. He uses /vt/ lingo (Re:song about haters) to review her songs. This is a review of Sedai no Scream by the way.
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He even said at the end of his Jigoku 6 review that "she is trying too hard to copy Ado". Nothing in that album sounds like Ado, but how would someone make a connection to Ado with Mori without ever watching her? He tries so hard to pretend he does not know anything about hololive/vtuber culture every time. Also, reviewing everything after listening for 10 seconds. As someone explained
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The Jigoku 6 album was in the yellow, until Brad came with his fans and army of zeroes, dropping the review by 11 points.
This guy cares way too much about farming pity points by crying in front of his fans, dude is more menhera than Mysta for gods sake.