I agree totally with what you say.The only part that disturbed me was when the daughter said how long they have left with her Mum 6/7 months ....who on earth told her this
The person concerned looked far less damaged by dementia than my Jan did 5 years ago.
I imagine the quote was put in for dramatic effect, or the daughter was just talking randomly. There may be facts we don't know, of course - these programmes are necessarily a distillation of a lot of material.
For my part, I only wish things WOULD develop that quickly once past a certain stage. It is the not knowing how many years of slow decline the poor person has to suffer - even to the decade - that is most difficult, for me.