While I consider myself of being part of a Linux-y bubble, I can definitely see people around me, who are, or where, in the same bubble, using PowerShell more and more and more. And, this is the interesting part, every single one of them has been saying that PowerShell is way better than e.g. Bash, or whatever you wanna compare it to. This is also because of the much more modern architectural design of Windows NT, which is and has been miles ahead of Linux, because it could learn from it's failures when it was developed. Same for PowerShell. It could learn from the mistakes that Bash made, and still has to live with.
Still, obviously, this is anecdotal evidence at best.
I'm a fair hand with the Linux shell and utilities, and I can say that PowerShell provides a lot of useful analogous capability in the Windows environment. I don't totally understand the model for PowerShell but the times I've had to dip into it it's been pretty good.
I'm gonna need a source for that quote because no, no one besides a couple of Windows admins ever acknowledged parity, just "meh, if I have to".