I don't see why switching off the recirc fans would compound the problem - quite the opposite in fact as it will pump the contaminated air straight out of the a/c.
Who is AOPIS? Their site gives no details of the organisation. If I was a sceptic I might think that they are involved with the firms manufacturing filters. It seems that only the Australians and the Brits suffer from this problem - the pilot organisations in every other country don't think it's important enough to concern themselves about it. In fact, only a couple of airlines in the UK seem to have a problem. I've been flying 757's for years with no fume events.
If crewmembers are dropping like flies because of exposure to contaminants, where are the multi million pound settlements against the airlines and manufacturers for causing this?
If there is no proof, as I suspect, this thread is in the right place - the rumours section of a rumours site.