Sometimes you have no choice but accept what has happened. Archie is already brain stem dead, which, tragically, means there is no way back. He has passed the point of no return, nothing can be gained by keeping an essentially lifeless body functioning.
I have some understanding of what his parents are going through. Just over 30 years ago, my sister received severe head injuries when she was knocked off her bike. She was single and in her mid 40s. My parents were in their late 70s.
After 2 operations the surgeons held out very low chances of survival and said that if she did survive, the best we could hope for was that she would be in or close to a vegetative state. My mother said that at that point, she did something she could never ever have imagined doing - and that was that sheprayed for her daughter's death, because the thought of her daughter being in that state, neither alive nor dead, for possibly years on end, was more than she could bear.
My sister died the following day. Her death was defined by the lack of activity in her brain stem, the same as Archie. We waited two days for death to be confirmed and were then able to donate her kidneys and liver, which we later heard gave new life to two young men and a teenage girl.
As Archie has been in his current state, on a life support system for so long, organ donation, is probably not now possible.
My deepest sympathies are with his parents, but denying the undeniable, can only make their loss more unbearable.