They probably can do that, but a lot of the connections Ukraine are using will have been donated by third parties, rather than directly purchased by the Ukrainians. How do they tell the difference between those, and someone claiming to be doing that then shipping the dishes to Russia?
Because it’s feedback on how effective their targeting has been when confronted with whatever electronic warfare and misdirection Israel was using to defend themselves.
That sort of information might let the attacker make adjustments to be more accurate next time