Probably because fraudulent non-disclosure (as alluded in your first post) as well as innocent non-disclosure (as alluded to in your second post) are both against the common law Duty of Disclosure as outlined in the PDS.
In the event of a claim under any insurance policy, the client's full Medicare records are obtained and compared against the details disclosed in the application and any subsequent information gathered from the client. The insurer is entitled to avoid the claim and refund the premiums paid. Would this really be worth the angst generated against the insured or their beneficiaries for 30K QFF points.
In addition, it may give rise to QFF cancelling their account (would have to delve deeper into the T&C's and would have been set out in the agreement between TAL and QF). Again, not somewhere I'd like to go.
I would recommend against anybody following this course of action.