Yeah, but this represents the bare minimum, the rest can be sussed out in the deal itself. Ukraine has asked China to be a guarantor as well as several EU countries. I'd expect russia to demand, at the least, Donetsk and Luhansk in this scenario and regardless of what Ukraine wants the status of those two needs to be clear otherwise they'll just be a pawn in a couple of years again.
Note: I'm not saying Ukraine should give up on them, just that, as the article shows, it is unclear if Zelensky included them in his statement.