Wallace's essay is a broader policy-based complement to the narrow explanatory essay on the ship itself Dr. Alessio Patalano produced for The Asahi Shimbun (Link) -- an earlier draft of which he published on SSJ-Forum and I excerpted here.
Reading the two essays will sharply reduce the wool content in between both ears as regards these big "escort" (the Japanese term) vessels. As to what ships the Izumo-class of vessels would be escorting...that is left up to the imagination.
In all fairness, I have take exception with one sentence in Mr. Wallace's essay:
No self-respecting bureaucratic organisation would invest in a $1.2 billion piece of hardware specifically for the purpose of launching jump jets that may not materialise for many years, if at all.I believe that that seeming improbable is indeed a pivot point of this famous sketch examining the Royal Navy's acquisition of the Queen Elizabeth class of aircraft carriers.