I'm pretty sure I didn't say that. That seems awful!
Although I'm not sure asking "why would you think that?" to someone who thought she was a Lich would require them referring to notes though.
I may have implied that some people have been typing like it's impossible to guess that someone probably didn't actually use knowledge their characters couldn't have.
--The party realizes there is no way they can crack the safe in the gaps between the guards checking in, but they have several good ideas about the logic behind the numbers used and who needs to be muscled to get the details. "Wait" says the player in the comfy chair with the coke. "Let's try 4-21-26." DM's face falls and it unlocks. "What do you mean, how did I know what page of the book the map was on, how old the queen was, and how many gold pieces were in the sack?!? .... Uhm, I just like Queen Elizabeth and that's her birthday." --
But seriously. I'm fine with the best way to deal with the knowledge use being to maybe change the combination from what you'd written down, or move on to the next part of the adventure if finding it out wasn't a big deal. Maybe it would be better if no one ever had to expect the inquisition.