Within his family he is called "Alex" and "Boris" is known to be his assumed persona for politics.
But he is not very erudite. He is fairly good at rhetoric, which they teach you at Eton and the Oxford Union, he has Murdoch and the Barclays behind him, but as his tutors and editor have said, he is lazy and fact-averse. He is just about educated enough to fool people who are not well educated into thinking that he is, but concealing it.
Harold Wilson, in a day before the Internet, was extremely erudite, a brilliant statistician, and quite good at pretending not to be. I suspect history will treat him much more kindly than it will Johnson.
Trump has learned one lesson and learned it well; saying stupid stuff on a big platform keeps your opponents out of the media. Bleach injections drive Biden out of the public eye. It really works, if your goal is to be re-elected.