Nonsense. You've just made that up. Both visas have a "employment prohibited" disclaimer. There's no difference between the two in that respect. A DTV is merely being promoted as being suitable for remote work, but a retirement visa will allow the same.
I'm in a group with let's just say "important" people responsible for 2 of the 7 international border crossings with Cambodia and also have connections with a Cambodian customs agent. If any one of these people are informed as to when it will reopen (I think they'll be given a heads up a few days before the general public) then I will be the first to know.