He presents far better than any other person I have previously seen advocate for a negotiated settlement, but I’m not sure his assumption that the Ukrainians have thrown everything at the counteroffensive is correct, and nor was his placement of any weight on Ukraine not being admitted to NATO - which is logistically impossible for lots of reasons.
However, overarching all that, which he conspicuously he fails to address in relation to entering into any form of negotiation with Putin, is that, like Hitler, he simply cannot be trusted to keep to any agreement that is reached - because he absolutely won’t.