Masteria Preview?

Future Bing came back to stop himself from finding something out, right?
Oh, damn, that makes the timeloop unstable, doesn't it?
F'uck. Forget what I said about the Visitor event being a stable time loop then.

Yeah, I was gonna say that it couldn't have been a stable loop since then our actions wouldn't have accomplished anything.

Basically, the plot was this (for anyone who may not know/remember):
Aliens have shown up and Bing luckily has created a suit to fight them, but the suit (absurdly, for the sake of the plot train) is designed to require a fuel that may theoretically exist in the future. So Bing gets the player to gather parts to create a time machine so we can go get this fuel. During this process, the player is impeded by the aliens, but succeeds in gathering all the parts, readying the time machine. Once the player goes to the future and gets the fuel, the suit is complete, and the player is sent off to fight the forces of the mother ship in the present. Of course, it turns out that the aliens were actually people from the future (Visitors) sent back because their world was fucked up after the player stole all their fuel. Wanting to set things right, Future Bing sends the player back in time to stop the time machine from ever being created. This time, the player succeeds in stopping the time machine.

So, basically, the end result of the event was a new timeline that exists as a paradox.
Originally, there was a nice, stable loop thanks to circular causality (Visitors create need for time machine which creates need for Visitors, ad nauseam) which, due to its nature, should have been impossible to change.

Why are people still insisting it's the Visitors when NEXON themselves said that the Visitors had NOTHING to do with Masteria.

While it wouldn't surprise me if they reused assets from the Visitor event, I, too, doubt that Nexon would directly connect this content to a one time event that happened almost two years ago.
That sounds like a really good way to alienate (no pun intended) all the players who weren't around for it.

That said, history should have taught us by now that just because something was once true doesn't mean it will always be true.
Yes, the Visitors event had nothing to do with Masteria, but that doesn't preclude them from connecting its fiction to Masteria in a future update.