Oceanic crust beneath the Hawaii region is flexing downward (not much), probably because of the load resulting from the volcanic piles. Measurements of drowned reefs can also suggest such subsidence, but it is sometimes challenging to discriminate with certainty between sea-level changes due to subsidence and those due to water-level rise, especially when both processes are probably acting.
All of the islands are also losing height (very slowly) because of erosion; the active volcanoes on Hawaii are also sometimes simultaneously growing in height because of added material during eruptions. Losing height is not the same as sinking, of course.
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