Using static resources in OnClick Javascript buttons after "Serve Static Resources from force.com domain" critical update

I've raised a similar questions some time ago when I first saw that critical update:

Critical Update "Serve Static Resources from the Visualforce Domain" still serves resources via Salesforce Domain

What I got there was, that the critical update has had no impact since SF was doing a 302 redirect. In other words: turning it ON or OFF made absolutely no difference for me. The resources has been served and loaded without error.

Still I'm using Resources at several places this way and I can only confirm they are working today.

Also I can confirm that the Critical Update is no longer visible.

Why can't I see this Critical Update?

The Updates are only visible in a specific timeframe in which you can turn them on and off. This is very selective only to Orgs to which these updates apply and only if Salesforce decides to show them. Usually once enabled stuff from the past will disappear after that timeframe and can't be manipulated anymore.