Reading between the lines of Esken statements over the past 6 months it looks pretty clear that they had decided to close terminal for the Winter so they probably notified Wizz of that fact some time ago. I don't know how many staff are being kept on but they'll probably want to maintain a core of essential staff if the closure is for only 4 or 5 months. I understand that they will be doing the equivalent of what we used to call, in my ATEL days at quiet times, 'hangar maintenance' during the closure period.
Esken still like to maintain the impression that they are doing all this in consultation with their 'customer airlines' in preparation for a Spring 2021 restart. How much of that is window dressing we shall see in the fullness of time. I've heard no rumours of airlines ready and waiting to commence flights for S2022 but my industry contacts are fewer these days than previously was the case.