Strange, it's now possible to rename "This PC" ?
Yes, it seems so. But i had to rename it back using File Explorer, because there was no rename menu entry after that.
It's up to the Windows Shell whether or not you can rename special folders like that. I think you've always been able to rename This PC, though?
Next time, try F2 
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Ah, sure, i forgot about that ancient F2 command for a moment. 