Yes he does but 10 years ago from when he wrote the article and used the 404 in Africa, the ammo would have been modern stuff I imagine. Note the ballistics of the Swift 404 ammo shown in the article has a MV of 2357fps and an energy of just under 5000ftlbs, that's up there with the best of them. Apart from the modern Kynoch ammo which still publishes the MV as 2125fps all other 404 ammo is loaded a good cut above that.
My 'old' Kynoch ammo from the 60's is the uprated stuff at 2225fps and likewise the Norma made Parker Hale 404 ammo I have was loaded to a MV of 2245fps. RWS has always been around 2300fps.

He may not have known what the velocity of the 404 was when he wrote his article and just took data from Wikipedia or some such source which of course is old hat out of date information as far as the 404 is concerned.