There is no response from Varktech at the related forum thread.

Btw, I compared new roles added by Members plugin:


and by User Role Editor plugin:


As you see the only difference is that URE adds “deprecated” ‘level_0’ capability, but Members does not. So called ‘deprecated levels’ are still a subject for discussion as WordPress continues to use them:

WordPress User Levels were deprecated just partially

So I just wonder to this moment, what was a reason for Varktech to use ‘poisoned’ word in relation to the URE’s created roles.
I plan make my own tests of Pricing Deals plugin with URE’s and Members created role to get a full picture.