If there are 100 people that have not gambled before but about to start. If they tell them to gamble and people are seeing them while gambling. Not all of them would first win. Some people will win while some people will lose. I know someone that gambled for the first time that lost the game immediately and he told me he is no more gambling again.
Since it's a matter of luck, no matter if it's a beginner or a senior in gambling, no one knows when the victory will come.
Have some friends with experience like your friend, where he started his first time playing gambling but lost and did not win then after that he believed gambling would not make him win.
So for me this is a myth if there is a narrative where beginners can win gambling at the beginning, I say it's not true.