That is not what is said at all. Your arguing with something you made up in your head.
Joyboy: I will seal my haki INSIDE YOUR BODY, and when the time is right, untie this knot. "
You: " He compressed it inside of a knot. "
I SEALED my watermelon slices inside my plastic bag and then SEALED my plastic bag in Tupperware
Anyway none of this matters
Emeth didnt have joyboy’s haki… Emeth isn’t capable of using Joyboy’s haki to do a barrier CoA or do hardening or use future sight using Joyboy’s haki
Joyboy made a haki bomb, put it in a knot, put the rope inside Emeth and then Emeth untied the bomb and it exploded… that’s all… Emery does not have access to Joyboy’s haki