All the supporters I have talked to are in favor of "reform", yes. The specifics of what exactly it means to "defund" the police varies pretty significantly between supporters though -- some say "obviously we still need police but maybe try sending in a social worker for the homeless guy who is lying unconscious onthe ground" and others say "defund means entirely defund, as in abolish, I mean what I say" (I'm assuming that is the slogan in question, but not entirely positive because the post I was replying to was vagueposting).

I’ve heard hundreds of supporters speak and the message is fairly uniform: reduce the operational scope and budget of police significantly and use those resources on programs - proven to work elsewhere - which help people and communities in ways that are more appropriate to the specific problem and more efficient in reducing crime. The degree in which the scope/budget varies, but of course some people are arguing for what they think is realistically achievable and others are arguing their ideal; both are valid debate strategies and don’t necessarily mean that they aren’t aligned.

The few people I’ve heard say “remove police entirely,” when asked to elaborate, meant that the entire organization/concept of policing should be rebuilt from the ground up, not that there should be no one in society available to respond to crimes occurring.