Probably about time-rocker adjustment

Typical adjustment would with lifter on the bottom of the cam lobe 1/4 turn past a slightly resisting while spinning pushrod. You can follow factory lash specs but I think you will end up close anyway. Warm engine.
Not confusing at all?

Eh....1/4 turn on what?

I assume you mean the rocker arm adjusting screw. Which would be one method of setting a hydraulic lifter's pre-load.

Then as an alternative to that process you want him to follow the factory lash setting specs? Would that not be for a solid lifter cam?

If he follows your first suggestion, and it is a solid lifter cam, the valves would be open all the time.

Does he have a hydraulic or solid lifter cam????????

Don't think anybody knows for sure yet.