"Dopamine fasting" is not a literal or scientific term, its not pseudoscientific either. It merely describes the process (perhaps incorrectly) of imposing some challenge to impulsive behaviours which is a perfectly acceptable way to help break these habitual behaviors, neurologically speaking that is perfectly sound, and consistent with scientific insight into this area. People often misunderstand and apply the overly simplistic "dopamine bad" mentality and think it's somehow about volume of dopamine which is laughably incorrrect for such a complex and nuanced process.

But critics can't see the woods for the trees with this one.