Dude - I think you need to learn on how various articles work, in my opinion, based on various magazines, not necessarily Flex.
In terms of Bob Chick, and others, they actually write or record their own words on what they want in the article. Either the answers, the topic, and the words. It is put down, and they there is an editorial editor, who actually checks it, and puts it in correct grammatical form, or as some people call 'newspaper or magazine' form.
Sometimes, they ask for an elaboration of whatever idea they wanted to convey, and sometimes, they just leave it as it is, but rearranging things.
As for a ghost writer, there are some, but not usually for every athlete. Rewriting it yes, but actually making things up, rarely.