The key is Return. It's always been called Return on Macs (AFAIK). "Return to rename" is just a convention, and it doesn't make sense, but calling the key Enter and not making a distinction between Return and Enter is a Windowsism, just like expecting Ctrl + C to work, the semaphore to be on the right side of the window and — for the longest time — expecting the green dot to "maximize" the app (since changed from Zoom to Fullscreen).