It is true, because I have also experienced that. When I first tried gambling on bitsler, where there is always free bitcoin for you to spend if you don't have any bitcoin to spent. So, the game that I played was DICE and I won 0.01 bitcoin, I know it is not big but we are talking about if it is true that the beginners are lucky in gambling, which is true, we are lucky, just on the first time though, because the other day that I tried again on gambling, all that happened to me was lost again and again.
That's hardly evidence of beginners luck being real because you only have yourself as the sample size.
If you'd look at broader statistics, I don't think there would be an anomaly for beginners.