Spot on as always Daryl!
Yes Mr Boddington should have known, or most likely he failed to research properly that the 9.3x64mm case is VERY different from the 8mm or 30-06 family of cases.
Mind you his sediments are very well founded, especially now that we have premium convention expanding bullets like Woodleigh or their mono metal hyrdos that make the solids (of which the likes of Taylor and English African game departments based there information on) of old are left well & truly behind when it comes to performance & reliability.
Lines have to be drawn in the sand somewhere, but yes the 9.3's should be allowed as a 'minimum' calibre!
9.3x64mm