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He used The Beatles travelling to Germany and having to perform for severl hours every night for months as the turning point between them being a band and them being a good band.

He didn't say they were "jamming and fucking around", or anything of the sort. He also didn't say "chord progressions is the only practise that counts", to reply to your other comment.

He also also didn't say "10,000 hours is a fact, 9,999 hours won't do", it's an anecdote fitting rule of thumb to tell a story.

But if you can find plenty of people who are world class at what they do, and haven't done anything close to 10,000 hours of doing it, have at it.