Our sources in Zaluzhny's team said that the former head agreed to refrain from any criticism of Zelenskyi and the President's Office in order not to provoke a political crisis in Ukraine. Zaluzhnyi is aware of his responsibility to the country and the military, that's why he gave in now.
Zaluzhny demonstrated principles and a statesmanlike approach, despite his resignation and the opportunity to earn political dividends. Everyone understands that the President's Office is preparing for a vacuum of legitimacy and removing competitors, and doing it as rudely as possible, blaming Zaluzhny for the failure of the counteroffensive against which he opposed in the spring. In Ukraine, they love and support the unjustly punished, but now time is on the side of the oppressed, who can only wait.
Our source in the OP said that the Office of the President is going to clean up all the military leadership that focused on Zaluzhnyi, leaving only generals loyal to Zelensky. Andriy Yermak wants to complete all the changes to the vacuum of legitimacy in order to keep the power in his hands.