Awaiting new Hyundai Theta II Engine Install

All Gp III oils have VII that shear. Yes.

Redline claims no VII in their 5W30. Is that incorrect?
I think that was a claim made years back, but I don't believe Redline has ever actually publicly stated that their 5W-30 is VII-free. AMSOIL used to make a 10W-30/SAE30 oil that was, not sure if they do anymore.

You could absolutely make a VII-free lube using Group III, it's just not going to have a great Winter grade; or not as good as one using PAO, which has inherently better Winter grade performance.
 
A 20 weight oil is what was said. Not 20 'Winter'.... The car you referenced still used an XW20 in a GDI engine, which I think is a fool's errand.
20W would be a 20 Winter grade (which does exist as a monograde). 20 grade or xW-20 would be the correct way to reference the use of a 20 grade while remaining ambiguous on whatever the Winter grade it carries is.
 
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