Site name in the title: " - ProGamer.Ru"

This is dynamic content (place in top-100 is dynamic)

Lost newlines

Quote author should be wrapped in <cite>

Vimeo player is not displayed correctly

Missing author name.

This page has an author specified below the article content.

Missing authors, Re: https://instantview.telegram.org/contest/progamer.ru/template12/issue1/

But we can support what's possible.
Originally, I was thinking the same as you outlined in the response. But then I saw people do it all over the contest, and it gets accepted.
And in practice you can do it quite successfully, as it turned out, to the extent of the checklist's wording: "Author name is required only if it is presented in the source article in a clear way (at the top of the page, at the very end of the text, in the meta tags etc.)"

It's too much space for such a tiny markers, IMO. And it's now isn't exactly clear, which image is for which line.
Turning them into captions seems plain wrong. Images are too tiny.
I propose the usage of "title" attribute for such cases.

I don't see any unsupported content

It is better to use formatting for blue text (which is used for many purposes) on a side, to avoid such kind of same styled text.

Missing author last name (should be Филипп Прозоров, or author nickname - DoctorAgon)