The issue isn't Russians using Starlink inside Russia (they have other option, e.g. wired system, etc. there); the issue was their using it for drones and other combat operations inside Ukraine (including Ukrainian territory presently held by Russia).
The point is that in order for Russians to use Starlink in combat operations in Ukraine, they first have to import them to Russia. All non-whitelisted Starlink terminals entering Russia should be immediately bricked to prevent this. It's an important part for denying Russians the use of Starlink.