Just because it beat indexes doesn't mean it couldn't have done better.
From 2017:
https://www.cnbc.com/2017/05/06/warren-buffett-admits-he-mad...
Someone probably said something similar in the 1960s when Buffet avoided crowded Go-Go era investments in the 1960s to his benefit.
"Not to diminish the accomplishments of Magnus Carlsen , but he has lost many games."
"Not to diminish the accomplishments of the world's best poker player, but he did lose many hands."