It is. However, I fear that it is quite difficult and that there might not be enough ciphered text to work with. A few people on the Dice Exploder discord server spent a good few hours trying to solve it and haven't managed yet.
I think this (along with clues in Charlotte’s essays) actually told me what kind of cipher it is (which I’m sure they’ve already figured out). Thank you for the hint, I shall begin in earnest
