You are correct. I was only joking, lemmy.ml is officially a general purpose server and this community is meant for everybody. But nonetheless, lemmy.ml users tend to be very leftist.
I'm confused by the second part, are you referring to lemmy.ml or lemmy.world when you say this instance? If people are claiming that the Lemmy devs are right wing... wow.
You won't see this, but... the Lemmy devs are Marxists, not right-wingers. Lemmygrad is definitely Marxist (Leninist). Lemmy.ml is left-wingers of all types.