It might be worth checking the history there. I read that the anarchists who want to eliminate the police are the origin of the specific phrase "defund the police", and the less "extreme" types are the ones who attempted to expand/dilute the meaning. Saying that the anarchists "use it too" and "adopted it" is, I think, a little unfair.
See also the discussions around r/antiwork a couple of years ago, where the subreddit had been pretty anarchist since its inception, before it suddenly got popular and watered down, and suddenly the original regulars who'd been there for years were being labelled as extremists who didn't fit in and shouldn't even be there.
That seems pretty similar to people interpreting "defund the police" as anything else than "abolish the police in it's current form"