Where is the line drawn?

The rules state:

You’re free to use any tools or libraries to create your game. You’re free to start with any base-code you may have.

You’re free to use 3rd party Artwork/Music/Audio assets, or assets you previously created, but we ask that you OPT-OUT of the respected voting categories (Graphics, Audio). You can opt-out of a voting category when you submit your game.

I saw this asset (NGSS 2) on the Unity Asset Store that adds softer shadows to one's game. Since the next jam is around the corner, it got me thinking...

If you use an asset like that one in your jam game, should that require an opt-out of graphics? The asset itself contains no artwork, but it does enhance the visual appearance of the game.

You could argue it's a library since it's just a bunch of code, but that doesn't seem quite right in my opinion since it's not really used like a library.

So here I'm asking, what's your opinion on this? Would you opt out of Graphics in such a case or say that it's just a library/base-code and thus separate from being considered 3rd party Artwork? Really curious as to what the general community thinks since I could see it going either way.