Yes, the sea water absorbing more sunlight due to lack of reflecting ice could cause it to warm significantly. But this is indirectly caused by sea ice melting

Yes, the sea water absorbing more sunlight due to lack of reflecting ice could cause it to warm significantly. But this is indirectly caused by sea ice melting, and a more speculative connection between ice melt and water levels rising. Furthermore, I'd like to see hard numbers, since most of sea ice is under water and does not reflect sunlight.