There are many genres of journalism. It's true that Gruber is not Reuters. It doesn't mean that he's not a journalist (even if he doesn't say so himself).
I don't think any of these things are apt comparisons to what Gruber does. In narrative journalism, the author includes personal details that add something to the story or reveal a greater truth about whatever they're writing. Gruber, on the other hand, just wants you to know how cool he is.
https://en.wikipedia.org/wiki/Narrative_journalism
https://en.wikipedia.org/wiki/New_Journalism
https://en.wikipedia.org/wiki/Creative_nonfiction
There are many genres of journalism. It's true that Gruber is not Reuters. It doesn't mean that he's not a journalist (even if he doesn't say so himself).