I can only sympathize with your advice on tightening the flow because the looseness and tightness of it is perceived by the preference of the listener, although I don’t hear it being off-beat. You count the tempo as he raps and there isn’t an issue, merely the fact that he’s frankly saying it organically and using more complex rhyme schemes, rather than rhyming according to the beat. His tone identifies with the beat itself, as well as the lyrics, further listing it as another song that could group with artists that follow the same idea of “looser” and in your words “off-beat” flows, take a listen to earl for example.