I'm not sure if I can really agree with this because furries historically have always been pretty left-leaning. You do see some right-wing furries but they're an exception and not the rule.
Just because you see some left-wing furries botting their likes on Twitter to dunk on right-wing anime accounts doesn't mean they're representative the overall state of the Online Left.
Most importantly, the Furry community has always been more degenerate than the Anime community where there are more sex scandals and child abuse scandals in the furry community than in any other community on the Internet so it's no surprise that many furries are leftists because left-wing politics tends to be softer on certain crimes than right-wing politics (it's to the point where furries even rival the Smash Bros. community in regards to sex scandals because even the Smash Bros. community is still nowhere near as degenerate as the Furry community).
Don't believe me? Look how people look at Twitter Leftists outside of Twitter. Every time some furry or a troon or whatever says something stupid (like how they think HRT should be readily available for kids or how they think animals can consent to sex with humans), those degenerates get memed on by the likes of Asmongold and other big content creators that makes them look laughable (it's to the point where even sometimes other left-wing content creators will meme on Twitter Leftists for their laughable hot takes).
Besides, Twitter doesn't accurately represent both the Left and the Right because anyone can bot their own likes there in order to give the illusion that people actually agree with the stupid shit you see on Twitter and anyone can spoof their location to promote their grifts.
The Kassenstien brothers (two of the most notorious left-wingers on Twitter) famously got banned from Twitter a long time ago for botting their own likes because they had terminal Trump Derangement Syndrome and more recently many right-wing accounts got exposed as posers after Elon Musk updated Twitter for Twtter profiles to more accurately reveal the true country locations of various Twitter users (a lot of those white nationalists that grifted on Twitter got exposed as brown shitskins that don't even live in the West in the first place).
I have a strong feeling that much of the left-wing engagement on Twitter is just as botted and astroturfed as the right-wing engagement that you see on Twitter. The Dead Internet Theory is a thing for a reason.