You are correct but reporters are hired guns to blow things out of proportion.
A Captain’s Mast allowed him to be dishonorably discharged even though he’s resigned his commission.
He’ll be Ok.
Captains Mast cant DD someone. Or discharge him at all. Reduction in rank, up to 30 days in the brig, half-pay, etc. That’s about it. Unpleasant but not career ruining.