The Danish domestic route Billund-Copenhagen hasn't been flown since the first Covid shutdown in March/April 2020. The route was included in the Summer 2022 schedule, but now it is not available for booking on any date in the released schedule (ie. until December 2022), as of a few days ago (possibly a New Year's "schedule cleanup").
I myself have a round-trip booked in about three months which include the BLL-CPH-BLL legs as first and fourth legs out of four. On the outbound, the flight is scheduled with an A320neo, and on the inbound it is scheduled with an ATR72 (which traditionally has been the aircraft servicing the route).
The two other domestic routes, CPH to Aarhus (AAR) and CPH to Aalborg (AAL) respectively, have been restarted several months ago, the AAL route even with competition from two LCCs, Norwegian and Danish Air Transport, and the restart from BLL has been moved out several times, and has now been removed completely from the available schedule, so it could indeed seem to be the case of a route cancellation overall. The routes between BLL and OSL/ARN have also been restarted several months ago.

Insideflyer DK has a short article in Danish about the BLL case: https://insideflyer.dk/er-sas-ruten-...enhavn-nedlagt .