Of course. But I think the poster above was referring to just posting random keys to the server.
In other words I don't have your key, or any key, but I have "all of them".
The correct response to this though is that "there are lots of keys, and valid keys are sparse."
In other words the jumper of valid keys that could be invalidated in this way is massively smaller than the list of invalid keys. Think trillions of trillions to 1.