@lalitk Perhaps I'm not finding exact product you're pointing to, but all I can find on Linkup is ethernet cables. They may call them LAN cables, LAN cables are in actual fact eithernet cables, theirs are shielded which is simply CAT 7 and CAT 8 ethernet cables. Certainly the cables themselves are immune to RFI, issue is connectors is how rfi enters, rfi rides the gound on these cables to next component in chain. Coax eliminates this. Please inform me to actual product in case I'm not looking in correct place.
Now, if this LAN cable is indeed actual cat 7 or 8 ethernet the issue of getting wifi to rest of house solved by connecting second router to primary router, primary router located in listening room, secondary router located wherever in house connected by cheapo etherenet/LAN cable, this supplies wifi to rest of house.
With setup I'm speaking of, you not only have the short runs of LAN/ethernet cables, but you're also entirely isolating audio network from wifi and rfi contamination.
Again, please inform me if LINkup has some new fangled cable I'm not aware of, if this true could be nice alternative.