if you start with 512 monkeys throwing random darts, you will have 1 monkey outperform the index 7 years in a row, and be hooray'ed as the master investor.
that's what these guys are.... and of course once they are recognized as the master investor, they will just market perform like a random dart monkey should.
the only guys who likely will keep perform after they become famous are them HFT guys... those are real high frequency edges that cannot be hit by pure luck.