He’s generally non-optimal on other things, but I certainly wouldn’t call his advice straight up bad on anything. Overall most people are signficantly better off following his advice than doing average-person personal finance things - the average person is pretty terrible with money and Dave’s plan is a huge step up from that.
It’s kinda like calling one diet bad because it’s not as optimized as some other diet, but really both diets are amazing when you compare them to eating McDonalds 3 meals a day.
I just put an 85" in my basement. That thing is annoying enough that it can stay with the house if/when I move. A 98" TV seems like it would be impossible to get down the same flight of stairs. If I upgrade again in this house it will 100% be a projector.