When Oracle were originally informed about it in April it wasn't a zero day. They could have rolled out a fix on their next scheduled update and it would have been patched for everyone before it became public.
They have one of the worst records on this. (Is SGI still is business?)
It's merged with Rackable (and called SGI), but I don't think they still support IRIX.
Despite sale of assets and similar names, they're separate companies.
That creates a near-constant stream of updates which is difficult for users & sysadmins to manage, and is why Microsoft and others have a "Patch Tuesday".
(I know that Oracle didn't do that here, but that's what the GP post was talking about)
If the sysadmins know when the patches are coming out then they can schedule downtime in advance and get things patched very soon after they're released.