I just finished this book and complained about it the whole time. The prose is amateur and peppered with cliches (e.g. you should be fined for publishing the phrase "their suit was so sharp it could cut"). His attempt to write about the inner thoughts of the characters was pretty simple. The descriptions of violence and horror also felt child-like, especially the dialogue during those moments (e.g. Redd's introduction). The landscapes are bland, with lots of repetition. Personally, the redaction technique got boring fast when he would take up entire pages of the book to convey absent memories. He could use his words to convey this instead of black-boxes.
I will give the author credit on how they deal with their characters' memories and the re-development of their thoughts, and the usage of time-jumping was reasonable (some books jump around too much, as if these time-skips improve a boring plot). Also the convention for how they solve their dilemma was enjoyable.
Overall, I think the author relies too much on a vocal fandom around the SCP Foundation to glorify the book. I think there is potential for a saga of books but there needs to be more effort in the drafting and editing process to raise the quality of the books to the level the universe deserves.