This page was fun. Especially, getting to read the diary helped me with forming the final piece that I lacked to properly picture the level. This is an obscure pit in which dread and anxiety reign most, and to top it off, nearly all of it is engulfed in darkness. The entity made it even better for me, as it enhances the overall uneasiness to a much higher degree. Was it not enough with having to deal with the level as is, now you know about the existence of a being within it that can even paralyse you on the spot (which if you ask me is quite not fun, especially in a dark tunnel like that). This gets my "pure Backrooms" badge, good job!
The M.E.G. portion was nice as well, it adds more to its worldbuilding. Gotta admit, when you mentioned the Frontrooms I got nervous for a second, but since you managed to execute it well ― like, leaving it kind of abstract and such ― it's no problem at all! It makes it more interesting (actually, it remembered me about The Barrier from Fandom with the wildlife and such, which is cool). Overall it's a nicely written and enjoyable page, have my +1.
Aaaaaand you thought I hadn't noticed? I saw it, the reference to Level 7.7! With the ocean, bright light, noclipping and such. Thanks man, I appreciate that. Very based.
Edit: reading more closely, I don't actually know if you were referring to it lmfao, but I still find it funny that we came up with such similar ways of noclipping.