Mr. J. Buz is, I think, a lot like my Mum and Dad. Their connection with reality is a bit tenuous. They make statements that they have heard (or think they have heard) that they think support some idea they have conjured up.
You can then correct them and explain why they have it wrong. They will repeat the statement in short order. They are older but their memories aren't that bad. It doesn't appear to be a memory thing.
They are incapable of being wrong. They will
not acknowledge being wrong about anything. They are locked in concrete now and cannot learn.
I think that Buz exhibits exactly the same behavior here.