There is a PDF of your citation available at https://www.researchgate.net/publication/335965217_THE_CHRON...

I searched for "long hair" and found only this:

>The man with long hair at Samos’: They say there was a Samian boxer with long hair who went to Olympia and won after being mocked by his opponents for looking like a woman; he became proverbial. Eratosthenes says that Pythagoras of Samos won with long hair during the 48 th Olympiad; Duris represents this as Pythagoras being excluded, challenging the men, and beating many of them.

Like many stories concerning Pythagoras, I wonder if this was some local fable onto which his name later became plastered.