I think you're being a little obtuse here. The point of the tweet seems to be that the laser links are up enabling a true global network without the need for nearby ground stations.

They have coverage over all seven continents because of that and I have very little doubt that it's been tested in those continents as well. "Availability" here seems to be a proxy for "is technically solved" vs. "is commercially available".

If you're asking "what's the difference?" Think about the war in Ukraine. Starlink wasn't (and isn't?) commercially available there but was able to be deployed in an emergency.