I thought he was saying using expensive shampoo damages the hair in the long term.
But I guess your interpretation is more accurate, dude is jealous.
Saw this article a couple days ago and I'm tempted to try something similar https://www.laurieherault.com/articles/a-thermal-receipt-printer-cured-my-procrastination
I use both because people in my home country use reddit and it is pretty useful. Those communities are non-existing in Lemmy.