Earlier quoted context omitted.
He is "whatever gives me short-term boost in popularity". Including doing 180 turns on whatever he's evangelizing or bashing.
Let's see. Roasting vercel is more popular than defending but his posts so far he seems to be defending and arguing in the replies.
Theo has long been Vercel supporter and was sponsored by them several times. In this case it could be a combination of him being genuinely interested in Vercel (a rare thing) and hopes for future sponsorships