Probably Zelensky promised there will be one last counteroffensive. If some success, he's probably thinking he will convince the Russians to accept less concessions.
This sounds like the kind of magical thinking that pervaded German high command in later 1944. "If we can take the port at Antwerp, the Western Allies will sue for peace" sort of unrealistic insanity.
Could you imagine if Putin or Xi had a drug addled, sex worker-addicted son who they kept consulting for policy? There'd be a trillion Atlantic and NYT think pieces lining up to attribute that shit to Oriental Despotism or the Asiatic Brainpan or some shit.