Less than the recession value of RSUs. They won't go to zero in a recession, unless your salary does too.
Do you keep your RSU's if you lose your job? I think that's the real fear here.
Unvested RSUs? Of course not.
Then that doesn't seem like a great recession hedge. I think the biggest immediate fear of a recession is losing your job, your investments should be available in that situation.
I think GP was saying you shouldn't take them into account, not that they are a good hedge.