Prof Harrison's opinion is different and I'm prone to trust him. These dogs are too sensitive : they were right in detecting smell of death in old furniture ! Nothing of that kind in the G5A though.
The fact they can't identify corpses since all humans smell the same is no news. Even the best device built to substitute dogs' nose will do no better.
Really, where is the reports that confirm that no second hand furniture was in the apartment Anne, because as per normal, I cannot find any sign of PJ ever having checked where the furniture came from? After all, it's not unusual that you furnish rental apartments with 2nd hand furniture in holiday resorts.
Nor can I find any reports on PJ checking that any of the guests brought in 2nd hand items OR inherited items, e.g. perhaps a suitcase bought on ebay, any other item that may have been owned by other persons other than themselves in the past?
Most odd, isn't it, since we KNOW that the dogs alert to items "bought from dwellings where the owner had died".