That is not the traditional route. It sometimes depends on the science. In mathematics, physics and other sciences you even submit a preprint to the Arvix even before you submit the paper for peer review. In those sciences virtually every paper is submit to the Arvix before publication. There's several advantages to this. All the world class scientists in these fields do it. If you don't it would even be frowned upon. It also very common to talk about things that aren't even close to being published, just not in interviews to the public, but in seminars, conferences and workshops.
So if you're already going online talking about your research everywhere, including conferences, it is extremely benefical to listeners and yourself, if there's actually a preprint (this doesn't require any extra work, he's already written the preprint). There's not a single downside for him to submit to the Arvix, whilst there are several for not doing so.
People seem to have a strange conception of how important the Arvix is. We complain about things not being open-source, whilst the Arvix is literally the collection of all scientific knowledge accessible to everybody and open source. It is bad practice that some scientists don't submit to the Arvix. It means you haven't understood what science is all about "sharing knowledge and gaining knowledge".