There's been lots of evidence that Ruby doesn't read the books she claims to, academically and recreationally.
She's admitted on multiple occasions that she reads study guides/character guides and does so before even opening the actual book. She claims this is so she understands the text before going into it, but that makes zero sense and this is quite obviously her reading Sparknotes instead of the actual text.
On top of that, throughout her degree, Ruby mentioned that she scheduled in a session with Blakeney before every single seminar to discuss the required reading. Ruby made sure that she and Blakeney were on every module together and that Blakeney shared all her Notion notes for uni. She claims to be a genius, yet apparently needs study guides and her best friend to explain basic undergrad texts to her. Again, it seemed like a blatant red flag that she skipped the reading and got Blakeney to bring her up to speed.
She's often completely unaware of major plot points in books she claims she read at least once, if not multiple times. With Call Me By Your Name, despite saying she read the book twice, she was unaware of the infamous peach scene. She claimed she'd just forgotten about it when commenters pointed it out (after she featured a scene in an Italy vlog of her messily eating a peach while pretending to re-read CMBYM, blissfully unaware what happens in the book).
She's openly admited to only skim-reading certain genres of books before and said she would just flip past any scenes that bored her (scenes featuring relationships, sex, drugs or anything that Erimentha Parker wouldn't agree with) even though this would be a huge chunk of a lot of books. She's been quiet about it since, but clearly it still happens, if she reads the books at all.
She's been caught recently getting ChatGPT to tell her things that happened in books she claims she read.
Her reviews and comments on anything she reads are completely devoid of any information beyond what you'd find in a cover blurb. When asked to provide more detail/information, she'll ignore people or offer bizarre excuses for why she can't.
Her reading/readathon vlogs never usually discuss the book at all. There's just a heavy emphasis on how many pages she read instead. It gives the distinct impression that she's just pretending to read for the camera, especially when you factor in that all her "I read X books in 24 hours" videos are blatantly edited together from several days of footage.
At best, she skim-reads everything and skips past major chunks of the book, then claims credit for reading the full thing. At worst, she's not reading most books at all and just uses study guides, lecture notes, Googled thoughts and ideas and Goodreads reviews as a substitute for reading the book.