From the RFC:
> This document argues that, while decentralized technical standards may be necessary to avoid centralization of Internet functions, they are not sufficient to achieve that goal because centralization is often caused by non-technical factors outside the control of standards bodies. As a result, standards bodies should not fixate on preventing all forms of centralization; instead, they should take steps to ensure that the specifications they produce enable decentralized operation.
Let me emphasize a sentence there for you:
> standards bodies should not fixate on preventing all forms of centralization
That is the crux of this RFC
It's an interesting read, it's very thoughtful, it analyzes from many angles. It's worth reading! But that is the broad sweep of RFC 9518.