Adobes solution probably only works if CC is still installed and running. Those reg keys certainly aren’t tied to Windows and a flag that says “unPinCCF” is probably just a flag to the process that sets it up and removes it.
Removing it should be part of the uninstall, but leave it to a megacorp to leave a little “don’t you miss us? See how cool it would be if this folder worked? So convenient!” dark pattern in there just to try and entice you back…