Dictionary similarity is not how people get their job descriptions. If you want to just pick a similar word from the dictionary, why are journalists sharing this stuff? Journals are typically private, after all. If someone read your journal, you might be annoyed, right?
Or, from your definition, apparently:
> the part of a rotating shaft, axle, roll, or spindle that turns in a bearing
I don’t think these journalists rotate much at all!
A better definition is one of… journalism.
https://www.britannica.com/topic/journalism
journalism, the collection, preparation, and distribution of news and related commentary and feature materials through such print and electronic media as […]
That said, I don’t think an argument from definition is all that good anyway. These definitions are descriptive, not prescriptive. Journalism is a profession, they do what they do for the public good. If you think that it would be better for the field of journalism to produce a contextless log of events, defend that idea in and of itself, rather than leaning on some definition.