Steven Dux is a Timmy Sykes clone. They are not scammers, but focus on shorting small cap/micro cap pump and dumps. It's a simple but effective strategy, the hardest part of the strategy is actually getting the borrows on the stocks to short, because most of them will be hard to borrow.
They are legit, but in no way would I consider him to be a great trader even if he made $5.5M over 4 years. What he does is like shooting fish in a barrel, and these days, with all the Robin Hood newbie traders buying all this small cap trash and bidding it up, there are a LOT of fish in the barrel. That's probably why he was able to make so much recently.
What they are teaching is not rocket science, its something that you could explain to an individual with average intelligence in a few hours. Of course, there is some nuance there, but you could probably make a list of 10 rules to stick by and that would roughly cover 80% of what you would need to know to execute the strategy.
But his strategy is not scaleable, because there are limits to how many shares that can be borrowed short, and most of these pump and dumps are in microcaps with low floats so the strategy can't handle the size that most institutions need to meaningfully affect performance.
That's why he's selling a service as supplemental income, because he just can't trade bigger and bigger, because the penny stock market can't support huge size.