I have to say if it were me I'd be inclined to book a meeting with him and let him know face to face how unacceptable you feel it was.
Clearly he was not actually either on his deathbed or dangerously contagious, therefore he could have staggered in even if just for that meeting. It showed a complete lack of consideration for you, a lack of courtesy to those people being given bad news at this meeting and a failure to take responsibility as a senior member of staff.
I would just feel as though looking him in the eye and making those points, making him squirm face to face would be more painful for him than having to read an email from you tbh. I'd feel that lets him off too easy.
Just my point of view though.