no wonder market does not always follow the same trend thus you can not depend on the same indicator always. You have to get more information from various indicators.
I would love to hear some trading strategies from your dear petulino, i hope you will not mind sharing some knowledge with us, because tbh i am not that much of a strategy maker, instead, i never made one strategy that could increase my profit ratio. The reason is pretty clear, i found it very complex to earn so little and work too hard for analyzing the market and making complex strategies to earn more profits in a shorter period of time. Now I am more focused on managing money via holding longer periods of time. But still, videos like the OP's one are convincing me as still as you said, any indicator can not give you 100% accurate results like the one in the video was giving, SO, yeah, it is more likely to be a fake one.
I think it is quite obvious that you need to make sure that all goes smoothly when trading and anything that is out of expected could be a trouble, because you make a trade based on what it looks like it will happen, and anything that deviates from that would mean that the result would not be what you are expecting. Obviously there are tons of people who will do what they think is right when it's in fact is wrong, so giving up on something is not a trouble and if you think that's a bad trade then you should stop, or a bad strategy as well.
But, when you are doing even the most right thing you should do based on every strategy out there, something could change along the way and you should be ready to cut the rope quickly before it goes even further south than you anticipated.