At least for me and some other people, medium.com is a negative signal of quality. Medium is full of low-quality and marketing articles, I'll associate your links with that, and me only seeing "medium.com" on e.g. HN means you don't have a chance of establishing a "brand" I trust by recognizing your domain as "good" after a few articles.

EDIT: adressing your edit, do you have any evidence they wouldn't be if they weren't on medium.com?