I really don't know if this is a positive change for how policy gets made, but it is happening actively right now.
I understand what you're getting at though. I just made a claim that people in policy circles are writing things under pseudonyms. You want evidence for this (justifiably), but this would require me to essentially out the pen names. Sorry, not going to happen.
What happens if someone Googles the pseudonym? Or tries to contact it? Do they use an anonymous email address or just not allow it?
The answer to this question is yes.