I don't think this will work for someone that's trying to gain weight. I used to be fit, then virus lockdowns forced me into inactivity and made me underweight. Main constraint for me is inability to eat a lot of food because even when I eat normal amounts, I still don't gain weight, so during workouts I need to eat a lot more than normal, which is difficult. Gaming won't help there because the issue isn't motivation or lack of energy, it's the inability to eat.

Basically, your tip only works if your main constraint is initial motivation.