What increase? There is a paper that CLAIMS there is an increase...however the ARGO floats don't confirm that at all. The supposed "increase" falls within the normal error factor of the instruments themselves so how the claim could be made that there is an increase is beyond anyone with even a passing knowledge of how science works...
You seem to have a reading comprehension issue. From the abstract of Balmaseda, Trenberth and Kallen's "Distinctive climate signals in reanalysis of global ocean heat content":
"The warming below 700 m remains even when the Argo observing system is withdrawn although the trends are reduced."
The Argo data shows
greater deep warming than the non-Argo data.
I find it funny as all get-out that you think you know "how science works" better than the three PhDs who wrote this paper and the several more PhDs that reviewed it for publication. When was the last time you were in the field, dude? And how far offshore was that?