-Sequence IIIg uses a GM 231 V6 from 1997
-Sequence IVA uses a Nissan OHC 4 cylinder from 1994

So, with no regard to gross valve lift, spring pressure, weight of the valvetrain parts, etc....we should blindly accept that if it works in a 231 V6 it should also work in a 426 Hemi with over .600 lift and 350lbs of spring pressure?

I'm not trying to be a smart azz, but I'm thinking "no"

I've worked with many engineers in my day, and here's the approach an OEM guy would take:
-protect for vehicles 7.5 years old and newer.
-Test both kinds: pushrod and OHC
-Done
There would be no concern or discussion re: modified engines, archaic designs like Gen II Hemis or Mark IV Chevrolets, etc. There is no reason for them to protect for anything older than required by federal law. "Older" means 7 years old.