Except they showed quite clearly how it could work with an example graph (while a rough drawing was close enough to the actual numbers) - basically chopping off all the increased scaling so 1-45 ilvl increase would be same as 45-90, and that would put us at below 200 ilvl stats (on the old chart) and likely below 150 at the level 90 end. This would also fall in line with their level 90 boost and considering all previous content 'trivial' and unimportant to them.
Basically they advertised numbers between TBC and wrath in their example, they put in a system so that how much they squished was irrelevant for old content (pretty much) and then pushed the numbers down so we are doing cata dps with MoP health, instead of TBC-wrath dps with Wrath-cata health.
Simple to understand?