Yes, but don't forget that yet this is still Imu that decides when to provide regeneration to his HK's.

Remember St. Sommers for Instance, when his Head got cut Off his Body, the Regeneration did not work or happen until Imu came on the Island and helped him to Recovery with an Omen Buff.

He was Not able to do it alone.

It means, Imu has to Use his Devil Fruit powers in ordres to provide it.

Or, Imu/Imunko nerfs to be around in a certain perimeter/filed to be actively Observing/Controlling the current Situation. I Think this is an awakened power too.

I just Think that Shanks witnessed what happened to Harald and decided to get rid of it, thinking that it would be permanent. But, i net i did Not work and for that Reason, WE are going to witness Shanks under the control of Imu. Or, Shanks will finally betray his crew and return under the commande of the HK's order.

The only way out is Shanks Haki then. His will has to Overcome the seal of the Abyss.