Virtual 20 MOA 100 yard zero

[FEENIX]

Why would the cant of 20 MOA of reticle be anymore error than 20 MOA of cant from a base?

You're achieving the same result…just one uses a canted base and the other uses the reticle to simulate your base being canted.

From one of the old-timers - Bruce is an optics SME (IIRC, he has a PhD in Optical Engineering) and owns https://highpoweroptics.com/about-us/