I may have been PIP'd

I was a long time manager (like over 20 years) of product teams. It has been a VERY long time since I was an IC. Via a reorg, I was put into an IC position (against my wishes) and patience for me getting my groove back is apparently waning. I *think* I got put on a PIP, but nobody actually said it, I just got a doc saying "here are my expectations" out of the blue. What's even stranger is that in my review just a month ago, I was given extra stock, so the messag