Well I guess this is yet another "nomenclature" problem, it's clear that the JIS standard for pressed-in cups/races is 30.0 diameter, but Sutherland's is also clear that the other size (30.2) is not what they call ISO, but "Campy" and "Italian". Their chart shows ISO to be 30.0, same as JIS, the Park Tool site calls 30.2 "Euro", not ISO. So at sometime either the ISO standards board adopted that 30.2 size, or people have been fast and loose with their labels...which given the square spindle taper controversy, doesn't surprise me.
BTW, Sutherland's also lists "French" and "Raleigh" as 30.2... but "English" and "Alex Moulton" as 30.0..."Austrian and East German" a crazy 30.8 and "BMX" a super-crazy 32.7, and this all for 1 inch HS, not even scratching the over-sized stuff.
YRMV, good reason to buy a digital caliper and use it.