Read this, specially the part where it says
[To clarify: it is also not acceptable to provide players with custom models and/or weapon skins that do not exist in the CS:GO ecosystem]
That whole text is strikethrough.
This is what makes it confusing, so does it mean that doesn't apply?
Reading everything else, they strictly seem to state that they don't want us
to trick player to believe that they have a skin they don't own.
It seems that I have to contact them personally.
I will update you guys here if I hear back from them.
In case someone else find this confusing.