PJ may or may not really be Pamela Jones, and could conceivably be either sex, but I have no doubt that PJ is a person. She simply says she wants to do her blogging and remain anonymous.
The research on Groklaw stands for itself. The real-life identity of the blogger is no concern of ours.
I think Groklaw has been enormously valuable - far more so than other online resources related to e.g. software patents. I'm sad to see it go.