Is Crimea on "this big hex grid" or not? If not, why not?
Because the US military/govt has a say in what US companies sell to foreign militaries and that's what the restrictions were at the time. Remember this was early on in the full invasion.
Starlink both in technology, availability and regulation angle is advancing so fast that saying "is it now" and "was it then" are quite different.
This is where the hex grid was previously on. Wayback machine doesn't seem to work as it's a web app https://www.starlink.com/map
Starlink is prohibited for use in Crimea because of US sanctions against Russia, and not because "Musk turned Starlink off during a Ukrainian attack".