Drafting a PG with no jump shot is a risk. And yes, drafting players from mid-major is generally considered a risk even if PGAB doesnt agree.
I'd say it's a case by case decision.
In his case I'd say he was a calculated risk. He was a 20yr old junior, which explains why he slipped under the radar in highschool and got to a smaller school.
From his college 'decision' interview:
Payton stated that he had interest from Tulsa, Tulane, Louisiana Tech, Wichita State, Texas A&M and several other state programs. But UL was his only Division 1 offer to date.
His measurements were off the charts. He probably aced psychological exams predraft, seems bright.