Are you the author of this post? Your HN user name matches the poster, and the username in the URL in the author page of the site at https://leandromoreira.com.br/author/dreampeppers99/
In any case I just don't think the author has made the case in a very clear way. Unifying all the codecs in a codec library through an interface is something whose novelty is lesser than that of everything-is-a-file. It takes more ingenuity to consider objects like pipes and sockets as files, and I hope the author didn't really lump them together. I just hoped the author would cover more things about this design pattern and explain his thesis more clearly in an article with such a grandiose title.