Defund means to essentially get rid of a department or thing. The phrase "defend the police" means "get rid of the police". It doesn't matter if there's some cartoon to re-explain away the phrase or a bunch of other people trying to re-define the English language. English is English, and words have meaning.
The "defund the police" movement failed because us liberals don't fucking understand marketing. Like, at all. I can't count the number of times some liberal movement crops up with their slogan and Republicans turn that slogan against them because nobody spent the ten minutes time to think about how that phrase or thing could be abused. For example, that brief time when the LGBT movement wanted to rename themselves to LGBTQIA2SUVWTFBBQ? Seriously?!?
It's like naming your baby "Assman McAssface" and wondering why he gets bullied in school.