“I don’t know why the people who provide medical attention at the jail got sued...”
Because they didn’t do their job, which was to screen incoming prisoners. Anybody who looked into that cell and saw him in distress should be fired, sued, and prosecuted.
The cop on the scene should be fired He could evaluate a man who couldn’t speak or move his left hand.
Not much of an excuse for this these days. There are very famous court cases where LEOs have used force against people having a diabetic episode. It has been integrated into lots of different levels of training.