That's the exact opposite of the correct approach. Unless it can be proven (and he doesn't, at all, prove his case) then there is no reason to not describe it

That's the exact opposite of the correct approach. Unless it can be proven (and he doesn't, at all, prove his case) then there is no reason to not describe it as such. (Grandiose is the exception - that's a stylistic judgement and quite apt here, irrespective of its truth value)