No talking is needed, the notes lie on the ground (and vanish if you finish the quest I think, never found the third note myself).
The passwords to unlock the doors (and access the levers) isn't the same as the password for the door with the console (which isn't even needed when using all 3 levers).
Well, the doors' passwords aren't even really passwords, they're just speech options with a specific effect when used, that are triggered by event flags.
And while the notes may be on the ground regardless, my question is this:
Assume a completely unspoiled player is playing FoV for the first time. He mindreads a vegetable, then eats it because the mindread says it powers him up. +2 stat points! So now he eats the other two vegetables on sight, and never learns the purpose they serve.
Now, he needs to get into the Archives to get the Elven Alphabet and talk to Thaddeus. But the door is sealed! All that's left is the pedestal, asking for numbers.
How is the player, in that situation, intended to learn about the notes that contain the password? What NPC will direct them to find those notes? Or are they just SOL unless they either find the notes by random chance (and figure out they are for the archives door), or unless they guess the password through brute force?