Had a look at some mocks from 2021.
CBS had Primo going 32.
“Knicks go youth here and grab Joshua Primo, the youngest prospect in the draft, who at 18 years old can really stroke it from deep and who made a strong impression at the draft combine with his ability to handle the ball and create off the bounce.”
https://www.cbssports.com/nba/news/n...m-at-no-1/amp/
Another mock at NBA draft room had Primo at 35.
Not sayin it means anything just interesting. He must have impressed the Spurs at the combine workouts and Spurs may have thought other teams would have liked what they saw too. Plus his age.