Looking at the example graphics in the OP post I would not think something as specific as the rtx-io matter, I thought it was something more conceptually general that could be applied everywhere without tie to a specific vendor.
Orbis OS might be a FreeBSD fork, but there is very little UNIX on PlayStation games.
Similarly to how little there is on Apple and Google platforms, regardless of the underlying infrastructure, where doing POSIX file IO is equally inconvenient.
Now, this whole discussion is kind of needless, given that she explains the issues on the article.