The key points:
He is able to be in drawdown from 8 trades in a row, because he is not risking a large lot size per trade.
He knows the market will retrace back or close to the original first trade,
So he risks little to gain little because he doesn't have a clue where things will be going, then he has enough capital to ignore the losses but also bets enough on the next move to recoup the losses, no only that but somehow after being wrong 8 times in a row he magically knows that the market will retrace, but just as inexplicably he didn't do the opposite, by gaining with the first trades and then gaining again with the retracement and ended up with a zero-sum no chance of making a penny risky strategy!
I've seen a ton of strategies on how to lose your money but this one is top 3.
A fairly simple strategy, but it requires good trading knowledge, technical and fundamental analysis and knowing when to enter and exit.
It will work on spot or futures trading using compound strategies, and it's effective enough for short-term trading,
provided you've got strong enough capital to keep making incremental purchases 2x more than the initial purchase.
That's Martingale on steroids, a 8 consecutive loss chain will need you to go to have 500x your initial bet in capital and risk all that to gain one unit, the risk of one more going also bad would see you unable to compensate with a new trade, and when you arrive at the point of making 100 trades, risking thousands of dollars for getting at most a few dozen dollars a day you're better playing roulette or dice.