My wife's taking GLP-1s for health reasons. The author's ideas about the effects of these things are not evidence based. It isn't a magic drug that makes people ascetics. She eats less, but she still impulse buys clothes and things. The idea that the drug numbs feelings is not at all what I see, while some appetites are diminished, we still both do art, enjoy going out doing all the same stuff as before. She's lost weight, her vitals are looking better, and we eat out less, that's it.
I'm taking GLP-1s and it's absolutely reduced my impulsiveness in ways besides food. Not completely, for sure, and being less interested in food actually means more time to spend on other hobbies.
But it's definitely done something to my non-food behaviour, albeit I'm not sure what exactly. It may well be that I was previously trying to satiate my constant desperate hunger for food with other forms of harmful addictive behaviour, and without the hunger, I just don't need that as much. The concept of satisfying one craving with another isn't new, after all.