Tom,
The Chevy one doesn't really say either way (Clutch or no Clutch), but does say "See Owners Manual for Detailed Instructions", but the Ford one that you posted clearly states "Depress and Release Clutch" when Up-shifting anyway.
I use the Clutch all the time, lol.
I was surprised how vague it was compared to earlier and even later
GM trucks.
I use the clutch too when upshifting.
I think the reason for clutching upshifting is to help release the
Torque from being in low?
I have more decals./trucks around here need to get more Pic's.
Tom