The issue was that the 2001 licence granted permission only to distribute "the CP/M technology" as part of the "Unofficial CP/M Web Site", so no-one else could legally distribute it. The 2022 licence removes that limitation and gives everybody the right to "use, distribute, modify, enhance, and otherwise make available in a nonexclusive manner CP/M and its derivatives."
The linked article is exploring what Digital Research products that permission might cover. CP/M? Explicitly covered. CP/M-86 and Personal CP/M-86? Almost certainly covered too. MP/M? Concurrent CP/M? No-one's objected to them being distributed under the previous licence for the last 20 years. But there's then a clear line of development to DOS Plus, which has a DOS userland on the PCP/M-86 kernel -- is that covered by the language about derivatives? If so, what about DRDOS proper? And so on.