Why do you insist that there are working strategy? there isnt any strategy at all. There is also no such thing as good or bad gambler if all the things that you are playing actually consist of luck based. In the end all you need is to have some bankroll to wager and you could play however it is still much better to invest then to gamble
he is saying good strategy, i am not sure if he really means it but in my experience there are good strategies and there is a difference between a good strategy and a 100% working strategy.
you have to think of it as a way to better your results not make them all win. for example with a good strategy you can win 20% more times than you were winning before.