The problem with "stock appearing" is who you are. I don't care what circut it is, if you're the right person it means one thing, if you're not, it means a different thing.
The rules for most circuts are like this, IMO. It needs to read EXACTLY what can and can't be done. Like the individual runners, it states exactly that they can't be there. In a case like this, it needs to say "Intake runners must enter in the stock location, and must be machined out of solid material. Access must be given to tech officals to confirm individual runners are not concealed inside a machined or welded plenum" There's no grey areas there. No individual runners, either visible or concealed, and officials have access to see there are no individual runners.