" There are whole groups eligible but maybe one or two when asked, would leave voluntarily to fill the head count reduction for that group"
The exact purpose of the "Interest In Leaving" process. It's not an informal shoot the breeze chat with your manager. It's an official process doc that had to be submitted a few weeks back if you were in an affected group.
And yes, by all accounts "interest in leaving" was quite low. If you think about it, most that fell into that category would have left to keep the health care subsidy by end of 2021, or at the end of 2022 to prevent their pension from eroding. Most everyone left here already made the decision that they would like to stay for a while, for whatever reason.