TTB, the way it happened in Alitalia was that the company re-issued new contracts, along the lines of the Air One contracts, in the same envelopes as the notice of 90 notice of termination.
Those who were CHOSEN to receive the new contract were deemed to have resigned if they didn't return their contracts signed by a specific date.
It would seem that the obstinate nature of certain LH CSD's heading a certain Union may be slowly forcing the company hand!
Both barrels, both feet and shoot.