Yea gonna have to agree with Andy here. (As to this video being click bait.)
That video was more rambling BS then anything that made sense. I suspect that Techlead has day traded, but I highly doubt it was at a loss that high nor with no lesson learned. Everything he said screamed I've never really done the research but hey I can sound like an expert! (Spoiler, he sounds like a fool)
That being said, I am sure there are actual traders (And probably youtubers) whom have day traded with large losses. I am also certain those are much better videos.
edit: Poster below make re-look at my post and well... Added more specific wording as everything has it's place. good or bad.