How is telling you that eventually you will get a neg or your sales will be effected illegal?

PJ has never said that a buyer shouldn't check that an item has been revised ot nor, PJ just said that some buyers do snipe so may be annoyed after they receive their item.

You asserted that if a buyer left a neg ebay would remove it. Unless the buyer intimated in the feedback that they were unhappy because of a revision there is no way ebay would remove the feedback, all they need do is be unspecific about why they are not happy and it will remain.

As to the items not being searchable that information is freely available in ebay.

So to repeat what Coops said, You'll learn soon enough, one way or another.

As I am not an Australian citizen I will ignore your implied threat.