Here is an interview that explains his position a bit better than my paraphrasing: https://amp.theguardian.com/books/2017/mar/07/yanis-varoufak...
He may be good at writing books or giving lectures but he was a complete disaster as minister of finance.
He’s very articulate, and not only does he make a lot of sense, I’ve never seen him caught in a lie.
And I have no idea what makes you think it’s pub talk, I’m from the land of pubs (Ireland) and I’ve never heard anyone talk like he does in one.
“Can’t discern from overengineered public talk” is plausible, but it would be very unusual to phrase it that way.
It’s not really clear that he meant "public."
[1] he seemed to have human values and of course knowledge about the topic