Agreed, but there is a difference between someone being in your house and someone dropping off a car.
There is a difference, but the argument can be made that discrimination is discrimination.
That said, how is that relevant? The letter I read essentially said, "This isn't over. There is no cure yet. You may be able to be reinfected. Keep everyone out of your house. Social distance. Dont let your kids play with other kids. Don't rehire your cleaning help. And if you're the type who thinks 'we all had it, we're fine,' the other communities in our township are currently experiencing high infection rates, so don't play around."