The particular website is irrelevant if, as you say, many other websites are affected.
However, I think you're focussing on another irrelevancy. It doesn't matter whether a website is RELEVANT for a TOPIC, if it is not LISTABLE ANYWHERE. The ODP guidelines define what makes a site listable -- and only after it's determined to be listable would anyone start asking what topic it might be relevant for.
And you cannot say that "nothing has changed" either. Because the fact is, many things HAVE changed. The ODP guidelines have changed. Editors have learned more about how to apply the ODP guidelines. More sites have appeared on the web, significantly affecting the practical definition of "unique content" -- and raising the standards.
You might look at some of the other sites that disappeared, and for each one of them, ask the question that really matters to a surfer: "If this site disappeared from the web, could I still get all its significant information from somewhere else on the web?"
If you're finding that the answer to that question is often "yes", then that indicates one likely motivation for editorial action.