Yes, I'm aware of that other gambler's fallacy to which you refer. It may well have prior call to the name "gambler's fallacy".
Nevertheless the one that I described, of gambler's being vocal when they win, and being silent or lying when they've lost is another one, thus giving the misleading idea that they are successful gamblers when they are not. That is also a gambler's fallacy. You can witness it at any racetrack or casino.
As for the second half of that - If BTC entirely collapsed tomorrow, I've already done better than break even on my original investment.
The point of my description of the gambler's fallacy is that you may well be ahead on this particular gamble (bitcoin) and you are being loud about it. But there will be other gambles in your life, perhaps tech-stocks for examples, that you will have or will lose on, and which you will keep quiet or lie about.
The big truth is that just because you won, doesn't mean it was a good gamble. It only means that on this occasion a random outcome happened to be in your favour. Another time it won't be.