Sphinx immobile?

[Viajero]

I have looked at the relevant threads here but still unsure as I have not been able to try the spell (research getting there).

On the one hand some threads here suggest Sphinx Pretenders can not move at all, no spell will do.

In the other hand the rule book suggest that immobile pretenders can move with either Gateway or Thrapeze of the Clouds spells.

Is the Sphinx specially more immobile than other immobile units? Can the Sphinx move at all with any spell?