On a slightly smaller scale we've sismic imagery (think like a sonogram) of a lot of the near surface plumbing on the big island so that cover Kilauea, Manua Loa, and a few other features. If you read about the 2018 eruption of Kilauea you'll see that in action as it's all about a loss of pressure in the system.

I'd also add that the hotspot didn't just make the modern Hawaiian Islands. There's a whole chain of eroded sea mounts that used to be other islands! And the direction they go in is in the direction the Pacific plates is moving. And this is a trait we see in other hot spit volcanos. Since the souce of the heat is from the mantle it doesn't move, but the plates still move over it.

Gniess butte.

Careful, they might end up in a parallel universe where the parallel version of their species ascribes so an even more destructive philosophy.