What murky areas?
Even though BS5839 allows the demise of the occupant and the FSO seeks to protect that same person, the guidance issued by the CLG to assist in complying with the FSO states that a BS5839 system is appropriate.
It will only take one incident that creates a newsworthy story, then the fire safety 'experts' will come crawling out explaining that the fire alarms standard 'allows' you to die in the room of origin in hotels. The media and the public won't give a damn about statistics, unwanted fire alarms, Mr Todds credentials or his expert opinion. Nor will the politicians, as Mr Todd is only 1 vote and won't make very interesting reading because nobody understands his humour as it is far too clever. Although, 10 years after the switch if more people are dying due to a switch over to smoke, then Mr Todds opinion will be most important, and his credentials will also be important to the point of "Why didn't the law/guidance makers listen to this man at the time???". (Providing the dementia hasn't taken full hold by then of course.)
All that being said, taking the lack of any other info into account, the determination seems fair.