You won't be able to convince him that he's actually a schizo, even tho he very clearly is.
That's why he's adhering so strongly to the most extreme characteristics of a schizophrenic, of actually seeing things, even tho that isn't actually that common.

By how he writes tho, and how he quickly changes his mind, replies to himself, has a nickname that he calls to anyone he things is opposing him, he's 100% in the schizoid spectrum.