If you have a video game boss that is immune to everything except fire... What do you call that?
If fire doesn't do bonus damage and just does neutral damage, you would not call it weakness.
"He's weak to..." in all video games exclusively refers to something that does EXTRA damage, not just something an enemy isn't immune to.
In video game terms, Superman would be weak to kryptonite as it would do extra damage against him, and would be neutral to magic as it affects him on the same level it affects anyone else.
So Superman is a Pokemon that takes no damage from everything except Dark, which does normal damage instead of SE.
Yes, that is another way to put it regarding magic. But then you would want to include something he is super effected by to compare to kryptonite.
Touche.
Though that might be more like one of the moves that lets Normal affect Ghost, since it removes invulnerability. ---
