Between the companies I've worked with and the incidents I've been through, I'd say AWS is well-known to be "very slow" at updating their status reports when something goes down.
Even had AWS liaisons tell us that things were definitely down even though the status page was completely green.
GMs/directors of AWS services are judged on how many "dashboard posts" they have (i.e., how many times their service posts to the status page). Incidentally, these same people are the ones in charge of approving posts to the status page for their service.
Guess why this is an issue.
Everyone on the ground at AWS knows this, and most AWS employees hate it.
Even had AWS liaisons tell us that things were definitely down even though the status page was completely green.