It certainly doesn’t appear to be an engine builder from what I can see. No pics of builds in progress, pics of shop equipment, etc.
If I had to guess(and I do have to), I’d say they’re buying the short block from another supplier, or they have a relationship with another shop that performs their machine work.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads