You are quite right, Angus. Things like that annoy me, too, and the big danger is that if inaccuracies appear in print in these magazines somebody in the future will take them as being totally correct and (surprise, surprise) there will be a two-stroke version of the Villiers Mk12 before you know it.
When I used to write my magazine articles for Tractor magazine the research used to take a lot longer than the article took to write.