Hello!
It is easy for us to remove entries for mechanics that are removed entirely. In the case of Skolex, the Ravening Burrow mechanic isn’t gone entirely in LFR, it’s different, and that it wasn’t changed by release is a bug that slipped by, which happens.
So what Skolex needs is to have the text entries involving the spell on LFR re-written, and that includes the Overview, the role based bullet points, and the spell description itself. Once that’s done, it gets passed to our localization teams across the globe which will translate it into all of the languages we support! Then QA is checking it, making sure everything’s right, and giving the thumbs up.
That’s a lot of people involved in a bug fix working across some vastly different time zones, so changing text is actually rather tricky. Compare this to the Wormhole Jaws mechanic, which we just removed on LFR after seeing the wing open and finding it wasn’t really a clean, clear, or fun experience. That was super easy, it wasn’t changed, it just got pulled entirely, and it’s easy to remove from the LFR dungeon journal. That’s something that’s done by one designer and verified by QA, no extra translation steps necessary.
This feedback is valuable though, we’ve seen and heard it from multiple sources, and we’ve already gotten started on an update for the Skolex Dungeon Journal entries! That update will have to be deployed in a full patch in the future though.