I stumbled upon a closure which has taken place very quietly.
Thank to Asiawaves for doing the investigation. I looked at their Inactive stations on 603kHz. I was surprised to see that Nicosia CYBC 3 was listed.
Without any obvious publicity the station seems to have closed in May 2021. This escaped the notice of WRTH and still shows as Active in the 2022 edition.
My search on the Nicosia kiwiSDR revealed no noticeable activity on 603kHz. On the other hand a solid signal still exists on 963kHz.
[mwlist has recognized the closure / mw editor]

Dan Goldfarb to mwmasts iog (2022-01-13)