If the text of Strong and Constant Currents is resolved in an inland land (e.g., due to Let's See What Happens), can it move Dahan?

If the text of Strong and Constant Currents is resolved in an inland land (e.g., due to Let's See What Happens), can it move Dahan?

Yes.
"One other Coastal land" doesn't re-check if the target land is Coastal — it just means "a Coastal land that is not target land."