A Smelly business.
It would be interesting if some people with specialist knowledge could post here, as the establishment seems to be in denial. If they're right it would be good to hear it confirmed from those with no axes to grind.
I know of rather too many people who've quite clearly been affected by life on 146s/757 for it to be a coincidence in my view. At the moment I'm inclined to lean on my granny's principle of, "No smoke without fire."