Sorry, not a good argument. The The theory is that the extra heat is hiding in deep ocean, carried down by currents. The Arctic Ocean is quite isolated from the rest of the world's oceans by landmasses and shallow straits. Currents in the rest of the ocean probably don't have much effect on it.
Personally, I think the oceans absorbing heat notion is silly, but this is not a good argument against it.
There are two basic problems with the ocean heating argument. First the increase is 0.04C with measurements spaced 100’s of miles apart with accuracy of about 0.005C. A little over half the ocean is not measured at all. But the main problem is that the ocean warming result (by Levitus) requires a model that assumes that there is an radiative imbalance and that the heat is going into the ocean. Given those assumptions (circular), they then assimilate the sketchy ocean data which was practically nonexistent before 2004 and make sweeping conclusions for the past 30 years. Not even GIGO. It is an exercise in “practically nothing in, garbage out”.