90% correct speculation seems a bit hard to achieve,
no it is not hard at all and there are many who are doing it. and their success rate is 100%. but the important thing is to know that if someone is that good in trading then they will not waste their time making youtube videos!
so to answer OP's question, no
that person is a fraud and he isn't even close to 90% accuracy. if he was an expert he would be buying coins not selling advice!
Well he sells his results... that's the point. I appreciate the feedback but if you check him out and THEN give me that assessment, it would hold more weight. Thank you though!