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That's most likely because the account only has 23 SP and you may not have noticed the company communication on our blogs nor logged into the site to see the changes, in an effort to create demand for Steem and SP, we amended the rules so an account's SP determines how many rules it can utilise, so the only vote that account did was for Steemvoter because it doesn't have enough SP to qualify for rules.

o the only vote that account did was for Steemvoter because it doesn't have enough SP to qualify for rules.

So this account was not using your service, so you didn't care to actually notify this user in a proper way, because you could still use his key.

you may not have noticed the company communication on our blogs nor logged into the site to see the changes

Any change of Terms of Service should require acceptance from user. This is perfect reason to downvote all your posts until you will not notify and get acceptance of all users from whom you are using the keys

I'm confused, I went to the steemdb link and don't see anything that sticks out as strange? Please elaborate.

I think they are referring to the fact the their account has been only voting for steemvoter posts. They just need to login to their account on steemvoter and set-up rules and/or up-pause their account. Looks like they haven't logged in in a very long time.