I think you're missing the "since" part. JM did not say that crossaffliction has written 30 articles, total. He's said he wrote 30 articles since the article about Stichter; and that of those, more than half were about My Little Pony.
(There's also a distinction to be drawn about "article" and "story"; a newsbyte archive counts as a "story" for Flayrah's purposes, but arguably not an "article". In this case, though, they have been equated.)
I think you're missing the "since" part. JM did not say that crossaffliction has written 30 articles, total. He's said he wrote 30 articles since the article about Stichter; and that of those, more than half were about My Little Pony.
(There's also a distinction to be drawn about "article" and "story"; a newsbyte archive counts as a "story" for Flayrah's purposes, but arguably not an "article". In this case, though, they have been equated.)