Responding to the two comments you've made:
at the end, it's revealed that even reading the whole page is dangerous like the entity (via the error code)
Not so much that the page is dangerous, but rather that it is unreliable. The tone becomes more and more hostile and extreme, don't you think?
(Tho not sure about for the image via red circle on a person, you didn't elaborate on that)
The person being circled is an Impercivable.
though, what's the last part of the don't section, is it implying that they are originally the humans of the backrooms before we came along?
I see this page as "up to interpretation", as even me and my co-author (Fokyfebecr) have different interpretations on what's going on here.
In my opinion, the last part of the don't section rather reveals the extant of how far gone the humans are. They are extremely vehement towards Entity 2-FR, to a point where it almost feels inhumane.
Oh by the way, have you followed the error's advice to not take a look at the source code and leave the page immediately?