After accepting, Nate added a blocking reviewer. If you check the logs in this review, the code landed without being accepted.
Maybe in such scenarios the review should not be accepted immediately.
I'd suggest reverting it and reopening the review.
Heh, no' it's the opposite. :) It means, "Do not land this patch without that person's approval." arc even warns you of this when you try to run arc land with a blocking reviewer who has not accepted yet.
It's basically a way of saying "looks good to me but please wait for such-and-such person's approval before landing the patch", but saying this with process rather than words.