Although reading back I realize that mention of the files was to support their theory that Nosferatu (or the Progenitor Bloodfiend) couldn't be contained by LobCorp, which if they're talking about the Main Branch, I don't think that's true because even if the Plague Doctor willingly entered. Even when he metamorphosis into White Night, the Main branch was able to contain them.
The main branch's nature is very...iffy.
The two closest comparisons we have to it are:
1. Angela's Library, which is
absurdly strong for an E.G.O.
2. Wuthering Heights.
Both are
very related to the River and are connected to the Light (Angela collecting + It is the same spot as the HQ, while the latter have the bough + being right above the River).
Both are
inferior in the magnitude of their existence to Ayin's HQ.
The absurd importance the HQ has to the entirety of PM's universe cannot be understated. It wouldn't be wrong to say that the HQ of Lobotomy Corporation might be the singular strongest structure short of the HQ of the Head itself.
Forget The Primogenitor, Whitenight, or any other Abnormalities.
The HQ was powerful enough to contain Gebura, the "Strongest" when she had the widest amount of tools.
It was powerful enough to keep Binah permanently stuck inside its 10,000 years of time loops. Even though she had
Fairy which can open anything.
Given that with a single Golden Bough, Catherine was able to essentially kill
an infinite amount of Cathies, it's questionable how absurdly powerful the HQ could be had Ayin utilized the Seed of Light (i.e the rest of the tree) for anything other than his (Carmen)'s ideals.
That and I assume that for sentient Abnormalities the files tend to be closer to the truth(or at least what the Abnormalities believe to be the truth) If only because the mere act of talking to the Abnormalities would ruin the ruse if the files aren't 100% right.
We don't know. The Files presented to the
Manager and the Files that are available for the Employees are 2 different things.
X isn't meant to learn the ins and outs of an Abnormality, only the bare minimum on what they should tell their employees to do. (You can pay attention to them working and see the extra messages pop out next to the containment chamber)
The files are likely not even the complete picture in comparison to the stuff our Employees have.
I wouldn't be surprised if Nosferatu
did approach Ayin/Benjamin to be contained, but once he is inside the HQ, he is
not getting out of there until the Seed of Light is germinated.
We
know from Heathcliff's Canto that 'Fated' actions/events related to the Light will sometimes be
impossible to prevent.
So far, Distortions are included in such a category. It wouldn't be a leap to say that the Seed of Light itself is another. So anything inside the HQ and it's cells won't be breaking out (because to do so, is to unbox the surprise and invite the Head's attention).