The basis of the claim is mathematical. Shorter periods usually can suffer from negative or positive variance and can give misleading results.
If you can't test a method by 100k bets, in a row, do 100 sessions of 1000 bets each. If a method can even reduce the house edge, in long run, it is playable and it has the edge. Coincidence, won't let you win for 100,000 bets.
If you can't test a method by 100k bets, in a row, do 100 sessions of 1000 bets each. If a method can even reduce the house edge, in long run, it is playable and it has the edge. Coincidence, won't let you win for 100,000 bets.