I'm not seeing the risk if it's a publicly available address. Analogy:

They tested every door lock in America.

They found that 64,000 door locks are trivially opened.

They put up a website where you can enter your home address to see if you're vulnerable.

If you enter your home address ("123 Maple Street"), they could lie and tell you that you're secure, but then go and rob you.

The thing is that they already knew whether 123 Maple Street was secure or not. They could have robbed you beforehand.

(Also, let's say that they never tested 123 Maple Street, and they tell you arbitrarily that you're secure. In this case, they still haven't gained any new knowledge.)