How would you explain this

Ok I know that most people hate the idea that UCN is an in-universe video game, but just hear me out please.

I was watching hyperdroids guide video and in the help wanted voicelines section we hear nightmare puppet and baby say the exact same voicelines that they say in UCN.

This to me seems to support my theory which says that UCN is an earlier version or prototype of help wanted.

But if UCN isn't a video game, then how would you explain the UCN voicelines that appear in help wanted.

And one more thing, most people that have commented on my UCN theories say that UCN isn't a game and it's just Cassidy creating this place and the other animatronica to torment William.

Now I dont disagree on everything, I believe that Cassidy is USING this place to torment William and that she didn't create it or the animatronics. Cassidy is using the game to her advantage. Which would make some of the stuff that happen in UCN make more sense, such as the charlie's spirit being here maybe even trying to do happiest day, Susie's spirit telling William that she was the first and that she saw everything he did.

the Golden Freddy death coin easter egg will also make more sense, the death coin as a game mechanic works on Golden Freddy (Cassidy) and she is no longer part of the night, but Dave (CC) the other spirit possessing Golden Freddy is still here that why he attacks us as Fredbear.

UCN being a video game also explains the weird appearance of some FNAF world characters, the obvious one being OMC. But there is an Easter egg where some FNAF world characters appear on the desk randomly, such as the bouncing plant monster, white Bonnie, and a third that I forgot their name ( I actually forgot all of their names but you get the point ).

Also there is another connection between UCN and FNAF world which is the OMC trophy ending in FNAF world. You can unlock this trophy through UCN by just doing the OMC easter egg there.

And FNAF world must also be an in-universe video game because one of the FNAF world locations is mentioned on an arcade machine in security breach.

And one last thing, it isn't as a big of an evidence point as the other but I still think it's worth mentioning, we play as William in UCN right? So why does Springtrap and scraptrap attack William, William is basically attacking himself.

So yea if UCN isn't an in-universe game how would you explain all of these points.

Btw I'm not trying to attack anyone's theories or anything I just want an actual answer