In crypto trading, there's no such things as guarantees in winning. I would rather guarantee a loss than win. For me, when it comes to talk about cryptocurrency trading, I don't make promises or guarantees that they will win. Instead, I do it the other way around and telling them that they should only invest what they can afford to lose.
These trading signals don't make guarantees or promises too, so I don't trust them either. It's better to learn how to win in trades via Google or Youtube, or some pro trading coaches out there.
Really, if somebody would guarantee us the result, he would become a billionaire soon as there will be millions of people ready to buy these "methodology". In reality, each trader should work out his own strategy, taking into account the knowledge he has and the experience he has already.
As for the losses, I do not know even a single person, who did not have them trading cryptocurrencies.