Curious, I went to the King County Elections website to check this out.

1) On the front page and on the page with information about registering to vote, there is a purple box to the right that says "My Voter Guide: Find your registration status and view your sample ballot." You enter your name and birthdate and click the button and it tells you your registration status.

This is not a new thing, I've used it in past years to double check my own registration.

2) If you click on the link to register to vote online, it sends you here: https://wei.sos.wa.gov/agency/osos/en/Pa…

I tried it out. Entered my name and birthdate and it pulled up all of my registration information, districts, a list of which elections I've voted in since 2005. In order to register again, I would have to click the link at the bottom of the registration info that says "this is not me"

I'm guessing Mr Fast must have registered again via mail, because I can't imagine he went through all of that and still thought he wasn't registered. But it is simply not true that on the website the only option is to register. (though they SHOULD word it all better so it is clearer that you can check your registration).