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There's been quite a few - Bobby Schmurder and TayK especially stand out. There's a fascinating YouTube channel by a guy called TrapLoreRoss which pulls out a lot of the info behind those kinds of situations which is well worth a watch if you're interested.
I think the key thing is that in a lot of those videos the rappers are unashamedly gang affiliated, and clearly and obviously referring to actual crimes which the police were already investigating. The lyrics name times and places and people. It'd be insane not to include that in corroborating evidence, though I agree it wouldn't be enough on its own.
This guy seems to be saying that rappers speak in metaphor and braggadocio, which is true. No-one thinks the guy from Cypress Hill is really out there killing people. Guns and murder are metaphors for power. Even a lot of the trap stuff has more of the theatre than the reality to it.
But something significant did change with the drill stuff. With a lot of that stuff, the music was secondary to the gang activity. And a lot of that made it to the UK too
.I don't tihnk there's anything wrong with using lyrics as corroborating evidence if they have hard evidence to back it up.
There is a long history of this in the US. I can't remember the details but I think there was a famous case in the 80s where rap lyrics were used to support a conviction, potentially of rape or assault?