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Problem solved,
I had to change the foreign key constraint Articles.ID_User which now leads to Fellows.ID.
Previously the constraint led to Fellows.User_ID.
I can finally use:
articles = Article.objects.select_related('author').order_by('-posted')[:5]
And indeed finally accessing it in the front by article.author, simple as that.
Yet I still don’t really understand why the raw sql query (using the mysql interpreter) with the INNER JOIN worked fine tho when referencing Fellows.User_ID, which was apparently not the case in the ORM.
Although it is working, my sql relational might be wrong or not ideal, therefore I am still open to suggestions!
Source:stackexchange.com