Diamond went bankrupt on the debt from the purchase of the RSNs. Not because they are losing money on the games. The RSNs on their own are profitable.
That's not what they said in their bankruptcy filing. They claim to be losing money with four teams:
The teams in the red include the Cincinnati Reds, Cleveland Guardians, San Diego Padres and Arizona Diamondbacks, according to one of the sources. Presently, Diamond stands to lose $20 million annually on San Diego alone, the source added.
If they lose $20 million on the Padres, that's not a good sign. Other RSN operators are getting out of the business, as has been said in this thread.