Nope. It surprised me when I read it earlier today, so I'm glad I'm not the only one that didn't know. As a clue, it was around the Ali era.
It's well known that Tyson was terrified of George Foreman. not that that means anything but it's interesting. Tyson sacked off the people that made him greatly a short while before the Douglas fight. He could have been so much more than he became.
Plus his new bird poured poison in his ears along with Don King and convinced him everyone was against him.
No. This guy is really well known and ranked eight in the boxing hall of fame. Just looking at the summary of his life on Wiki, and it reads like a country and western song.
Just to ease my paranoia, here's the quote I read. It's well worth reading this guys Wiki page. Joshua is the second boxer, after #####, to win a world heavyweight title whilst still reigning as Olympic champion at the top weight.