A quote from your link:

The technique slowly drowns subjects by blocking the air passages with flowing water while the subject is immobilized.

The woman had dementia and this is one sorry state of affairs that people who are supposed to be carers did this.

The woman, most likely was somebody's mother, grandmother, sister or perhaps wife, put into care because of her condition. 89 years old, dementia or not, she deserved respect and got none.

I hope charges were pressed.