I am not defending much of what I see here, cause all this shit looks sketchy af, but posting clips of blind dets seems like data dredging (or p-hacking) to me. If sin streams most of his games/scrims/pugs and most of the players he plays against also stream, the ability to select clips of him blind detting automatically increases far beyond that of other demos who don't stream. I could easily be wrong (since I do not play with him or against him) and he is known across the board for these blind dets constantly. There being a handful of clips of him blind detting doesn't seem that sketchy, as people are only showing the clips of him doing anything successful with his blind dets, and ignoring all the other blind dets that get nothing.
tl:dr he probably is cheating, but cherrypicking clips of him blind detting isn't really indicative of anything on its own. I am sure you could go through streams of other demos and find them getting lucky dets too. Is he cheating? Looks like it from the offset, but the cherrypicked blind det clips seem irrelevant and only creates more of a witch-hunty environment in my opionion. Interested to see how RGL addresses this.