I think he means that low-dose point where psychedelics are just some really nice stims (~50ug with lsd). Not sure why you would take an MAOI if that is your goal, and there's a good chance harmaline would interfere a bit, but surely it must be comparable to low-dose mushrooms.
IME, phenethylamines serve this purpose better. The headspace just works out better, and with 25c-NBOMe for example you get an almost empathogenic-like euphoria. I did find 4-Aco-DMT to be a nice sit-down and enjoy type of drug in low doses, but in the end wasn't really worthwhile for me (cost, tolerance interferring with real trips) to continue using that