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.
So with a 1 week trip to Vietnam no issues but perhaps do the same with your Laos trip? Spend a few days in Tha Khaek, do the loop etc. Lots to see and do, you can easily spend a week there, just in Khammouane province and not get bored.
There was a risk the Thai embassy and consulate General in Cambodia would close, but that risk has disappeared now I think. Hopefully, Thai and Cambodian ambassadors will soon be able to return to their posts.