Erm, I think he means "would Tesla even 'upgrade' you from 2021.40.X --> 2021.36.X if you would be accepted into the beta?" I'm wondering the same thing too... Tesla seems to be working off the 2021.36 "branch" of their software bundle and I'd assume they don't do downgrades. (Within a "branch" or at least within whatever subunit after the second dot is, they can clearly do downgrades, as they did during the 10.3 debacle:
2021.36.5.2 installed. Car wants to downgrade…). If that isn't an upgrade path that's possible, people on 2021.40.X are kinda stranded as of now. (I'm just hoping they rebase the FSD beta on top of 2021.40.6 or later with FSD beta vnext so there will be FSD beta
and waypoints, which will be rather cool if they interact properly.)