Yep, not true at all. My solution has been to just stick to smaller/niche subreddits that appeal to my interests but stay rather small. And I can (anecdotally) say that the majority of them are apolitical.
I just deleted my account over the current reddit situation with everything being about the war. It is important, but I have enough information overload as is without having to sift through 1000 russia/ukraine memes. Reddit calls itself "the front page of the internet" and the front page is very much political.
"but there is currently very little activity there for some of my interests."
my interest is mostly media and even before this past week it feels like every subs got polarized over the years. Anime subs drawing lines over what kinds of characters and genres you can talk about, gaming subs banning discussion of certain games over staff politics of a multi-thousand employee company, art subs devolving into arguments over nude figures (art subs, where you submit typical artistic exercises and expressions which include figure drawing). And you can make an entire essay about how r/movies has shifted over COVID.
They come from a good place, but they do not at all come from a realistic or reasonable one. And some are just outright toxic. Maybe if I could stick to something super niche like woodworking I'd be fine, but man has media as a whole just gone into overdrive where everything is political.