As someone who currently has a pretty emotionally stable life and can totally relate to how you feel right now, I think the "emotionally stable" part is what prevents you from relating to the parent comment.
Back when I had a lot of emotionally turbulent events happening in my life, I was in the same boat as the parent comment you are replying to. Things in life going extremely sideways and leaving me heartbroken/depressed were what pushed me to that same kind of workaholism described above. Every single significant side project I wrote was during some awful-feeling events happening in my life. Those were also the times when I spent the least time doing "fun" things (e.g., videogames), because I just didn't feel like it.
That drive for me had nothing to do with the actual desire to make money or have career advancement, it was just a mirage. In fact, I would say I have more of the actual desire to make more money and advance in career when I am in "good times", but the drive isn't quite there. But when the "bad times" come, I have no actual desire for money/career advancement. I do however get that insane intrinsic drive to just get away from all the "bad things" in life at that time by diving deep into working/studying/etc. It wasn't about money, it was about doing something productive, because most of that work (at least for me) was just side projects that I didn't get paid a dime for, and neither was I expecting or cared to get paid for it.