It is as the style guide says, actual (parallel) editions but not just based on titles. It only applies to physical. No digital entries should use a hyphen for their edition name.
The style guide original intent was to refer to physical games that have a regular version and then a LE or CE that comes with extra stuff, often in a different box.
When the vote went through, no one went about fixing all of the (now) incorrectly formatted names, so you will still see some around. We try to fix them as we come across them but it just takes time.
