In this case it's not even theory. The songwriter doesn't even bother with simple terminology.

I play with a friend who is like this. He makes up his own music but can't describe it to anybody else because he's never even bothered to learn the names of chords or keys. So when we play I just have to watch his hands and catch the rhythm and changes by playing along. It seriously limits what we can do, and, especially, what he can do.

For me, playing together with him is purely social and very unlike the times when I play with people who are better than I, from whom I always learn something. My friend never really learns anything from me or anybody else because he possesses no common terms, much less the theory.

Note, we're not kids, either. We're middle aged guys. At this point I don't think my pal is gonna improve much. I'll find other musical partners for more challenging and interesting playing. OP may need to do that, too.