True, Kav, True. He will , in all probability, win very often but I think he should think very carefully before betting real money on it. The Reward to Risk ratio is too great particularly if he is thinking of using a Martingale. Frankly, I suspect that many who have started on it never stay the full course .
I think there are better ways to bet on roulette.
Like you, though, I think there is too much emphasis on the Maths of roulette. It is only a guide- a tool to be used.
A much greater problem is the uncertainty of outcome of each spin . Bluff and bluster or theorise how they may
NO ONE can predict with certainty the outcome of an uncertain future event. We can only speculate and speculation IS gambling.