Now here's the STUPIDEST COVID-19 restriction I've heard to date...

Sounds like a way to drum up some extra business for the groomer, since they WANTED you to tell them to give the dogs the shots so that they could then do the grooming. Plus, if they told you about this requirement BEFORE you brought the dog in, you might have said no or gone elsewhere. Once they have your dog in possession, they know you are more likely to say "OK, just go ahead".

So tell me, how is there ANY Covid protection to the dog or dog owners just 5 minutes after having the shots up to date? Did that instantly change the health of the dog?

While the rest of the world spends BILLIONS of dollars trying to come up with an effective COVID vaccine, turns out all you have to do is go get a rabies and distemper shot from your local vet or groomer. COVID threat instantly GONE! Amazing.