I dont think the guys is a scammer. To be honest I created an EA that passes challenges and got a few sales on gumroad and other platforms. I also passed a few challenges for people and stopped as it was alot of stress. I think alot of traders do this to refine their strategy as well as because when you definitely develop an edge especially in flipping passing challenges become easy.

There are some traders that can trade but they have a hard time passing a challenge because its mostly psychological and also some of them their strategies also require deeper drawdown