I'm confused as well. Why is it named as RC in one area, but Beta 2 in another?
Here's a few of my theories for different directions in which this could go.
Theory One
Big Sur 11.0 releases today/tomorrow/Tuesday. 11.0.1 is actually Beta 2, not RC, and once Tuesday's announcement is out, a future Beta 3 will be released, with information about the new AS computers embedded inside it. The RC naming was a mistake.
Theory Two
Big Sur 11.0 comes on new computers with AS only; 11.0.1 is the general release for Intel computers (releasing today/tomorrow/Tuesday); and 11.0.2 or 11.1, or whatever, will bring both AS and Intel together. The RC naming was correct; the Beta 2 naming was a mistake.
Theory Three
11.0.1 is at RC for sure, and will release on Tuesday as 11.0.1, as a slightly higher build, this build containing information about the forthcoming potential AS computers. 11.0 is completely skipped.
I don't know if ANY of those theories will come true, or if any of them are correct, but those are just my wild guesses. Definitely a bit confusing but interesting developments!