Did you read the article? I personally know two people trapped that way and died in the hospital. There are lots of stories like this, even here on FR. (Read post 4) That’s why when my folks got covid in October I did not want them to be admitted. They weren’t and recovered fine.
The article clearly explains what’s going on.
The overwhelming majority of the Covid cases in my hospital's ER are sent home.
Some are positive are are kept over night. Others a ‘’high risk’’ which they're in effect negative and others(like what happened to me) are ‘asymptomatic'' which means who have it but don't develop symptoms. However no one is forced to remain in a hospital against their will. The only time you are is if you're having a psychotic episode or you are a danger to yourself or others. Then the law requires a mandatory 72 hour observation period. I can assure there aren't any mad scientists running around hospital emergency rooms forcefully jabbing people with Covid vaccines. What hospital did this happen to your parents? What state was this?