I'd argue that Dev would be considered a "plain jane, oat bran liberal" in a vacuum. Then again, in a vacuum, for the longest time someone like Tim Pool could also be considered a liberal.
However, in the current time and situation, Dev has gone so hard in his TDS/RWDS that if tomorrow Trump/prominent conservatives say "the sky is blue", Dev will turn and twist in any way possible to try and go "nuh-uh, Trump/RW wrong (and bad)." Especially on the topic of trans, where Dev seems to be simping HARD for almost any and every pro-trans thing there short of giving bathtub estrogen to pre-teens (and god only knows, he might even go "oh, that's a nuanced topic; here's situations where it might be alright to do it" if he simps any harder). Meanwhile, most liberals who aren't crazy progs won't go that far; most they'd go for is something like "call the tranny a 'she', update 'her' loicense, maybe even allow 'her' to use the ladies room if 'she' passes that much." But they don't allow it to get to "give meds to kids" level, AFAIK.
It really seems to me that just as a lot of Dev's old friends (Scrump, Sargon, etc.) went right-wing to retarded levels, Dev has gone left to retarded levels. Just talking about more "social left" moreso than old school "economic left."