Well, other than the Rigby, he had them all right.
Probably should have listed the 500/465 instead of the 416 and he should have titled the article noting that these are dangerous game cartridges rather than more broadly double rifle cartridges.
Sticking to double rifles more widely, he should have had a medium like the 400/360 or a 375 Magnum or 2-1/2” in there.