Of course its pure confirmation bias and pure luck. Do we ever hear of the ESPN guy that goes 5-20 or 10-15? No.
If Galloway or anybody else thinks it isn't luck, and he can go 20-5 again, next year just bet Galloway's picks at full Kelly criterion %. Start with a meager $10K bankroll. Your expected bankroll at year end, after another 25 bets, will be $7.9M.