I completely agree that it’s dangerous. But watch his videos of what he does and in particular when. Usually after London closes and there’s no news. It gives very little likelihood of a big trend taking off, so the chances of eventually winning are high. Plus there’s more to it than just adding to losers.
I’d say with good risk management and a good ability to read the markets would make you win overall for the group of trades in the high 90% region. I think even if you get a big loser, you’ll win more than you lose. Which is what my ea results suggested, and it wasn’t very good at picking entries.
All that being said, a newbie is very likely to lose far more often and not have adequate position sizing, so very dangerous there.