Does This Debunk the "Coolant Can Flow Through the Radiator Too Fast" Idea???

About 15 years ago, I had a radiator recored by a guy that ran his rad shop for probably 60 years. I admit I do not remember how the subject came up, but he mentioned sometimes using a lower pressure radiator CAP. Of all the yap yap I have read on FABO about cooling over the years, I do not ever remember such being discussed.