I'm still puzzled, as you seem to be both defending and contradicting EY's view that:

the reductionist thesis is that we use multi-level models for computational reasons, but physical reality has only a single level. (Italics added).

I'm not actually attacking this view so much as regarding it as a particular convention or definition of reality rather than a "thesis".

Perhaps you are reading "best characterized as" as "best modelled as"? I'm not saying that, just that this is the sense of "reality" that EY/the wiki writer prefers to adopt.