How would Loki even know where Shanks is? And will Loki really be uncuffed due to that?

[Warmmedown]

Shanks travels around. Does Loki have crazy sight haki for particular targets?

Is that really going to be what makes Luffy release him? Or will it be something else?

 

[Future Warrior]

We can assume Shanks met with Loki before departing Elbaph.

 

[Symbiote]

He could just be a lying asshole.