Houston, we have a problem

That explanation was a reply to Infodude's post about fusion being a skill.

Weren't the old gathering skills actions?

They were skills, just like the current ones.

All the Actions are technically Skills.

They couldn't have been "skills". Otherwise you wouldn't have been able to get points in production mastery for doing something "without using a skill".

The server decides whether or not to give you exp, not your client.

Yes, but what the client displays is how we usually pick the terminology. Though that line could have just been more of Nexon's famous typos and inconsistent/imprecise/inaccurate wording.