It doesn’t. Nor does it have to. Lol

But if I had to force a connection:

Imu told Harald to turn Elbaph into a military rivaling the Navy

Loki proves (through attacks like Thorheim) that it is possible to infuse elemental attacks with Haki, meaning the Admirals can very likely also do it

Harald himself is a huge middle finger to how all the CoC sucker-