I don't think the parent is making a point about ownership, but rather publishing. He's saying that in 2022, if you're not competent to publish yourself, it creates doubts about what you have to say about high technology.

I think it’s just the branding awareness that is suspect.

You can host a WordPress site on blog.yourcompany.com for an amount that rounds to $0, and it will probably satisfy most people who dislike Medium and other aggregators.

Or you can roll your own of course, but the extra geek cred you will get for it is minimal. Not saying don’t do it, I’ve done it more than once, but do it for the doing.

I guess I can kind of see the point if the post is specifically about tech, but OP said "any article hosted on medium"