They sort of imply that only the Studio display would have given him a DPI increase over his previous 27" 1440p display. Any 4k screen would have also done that. Then he concludes that 600nits is unnecessary and that he doesn't need or want the USB-C ports. I have no idea why he went with the apple display instead of any good 4k screen for 400$, or two of them.
You can do non-integer scaling to change the UI size, but then it becomes blurry.