I love Jaylen, and think he's a very smart guy, but this quote is really shoddy, analytically. The reason there's a perception that athletes aren't intelligent, on average, is because it's really fucking hard to find humans who are 6-2 to 6-10, have incredible motor skills and kinesthetic sense, are very fast-twitch, are disciplined, and also have high IQs. Everything except the last is basically a requirement to be an NBA player, with the last only being moderately helpful.
Blaming that perception of athletes on "racism" is incredibly dumb/poorly thought out, and I'd expect more from a smart, thoughtful dude like Jaylen.