Because her card doesn't specify either empty or unoccupied, she can Pass onto a Cryptolith from a level 9 space/Cryptolith.
The question of Pass isn't moot, here was a situation I was in:
On Island Plane Crash, Nahiri (on her last 2 Life) was between the last Restless Zombie on height, and equal to Liliana on her last life, who was using a Sand tile that Nahiri raised.
I wanted to kill Liliana before the Zombie so they don't respawn.
The zombie is on a height of 4, so stepping off to the spaces on either side would cause me to take a LEA from the Zombie, and without a way to Pass Through Stone against it.
Ultimately I just attacked Liliana and failed, and then got killed.
However, if Passing Through Stone 0 spaces is an option, I could have risked the 2 LEAs for the 25% chance of destroying the Zombie before potentially destroying Liliana. Risky, but it's almost game over, and that Zombie was buffed with enchantments.
I try to give the designers the benefit of the doubt. People thought Inspired Charge giving +1 Defense until end of turn was a mistake until Rabid Bite made the "Fight" power known. Sadly, there's no Green/White Planeswalker to use the two cards together, but point is, I assume intent.
Which is why I could be convinced that "Move to... space" is designed to be a different thing than "Move" and "Place" because it requires an actual change of spaces.
I might actually be making the wording seem worse than it is by over speculating about what "Move to" means
