In my opinion there's no real discussion to be had on the things he is saying recently, so dismissing them as the rantings of a mentally ill man is the most charitable thing to do. If he's not mentally ill, then he's an extremely ill-informed anti-Semite who either believes outlandish things or pretends to for engagement.

No one is accusing Candace Owens, for instance, as being mentally ill for her beliefs, and Bi-polar has some very specific tells.

It seems like consensus is able to make that distinction without too many problems.

Even if he’s known to be mentally ill, his ideas can still stand. Take Ted Kaczynski for example. His actions were inexcusable but his ideas and writings on technology and its relationship to society have value.