LOL - Yeah, I noticed too. But skipped mentioning it. Discharged would have been the right word.
On 2nd look at the article, the word released might have caught on from
Rajesh Khanna, who is undergoing treatment in Lilavati Hospital for the past six days, will be released in a day or two, his estranged wife Dimple Kapadia said Thursday.
"Rajesh Khanna is much better now. He will be released from hospital in a day or two. He is doing much better now," she told IANS.
We can also ask , is he a film , that is getting "released"