That's really lousy advice, why are people determined to upset buyers?  It only ends badly for the seller.

I have no desire to upset buyers but this person is not a buyer, they are a tyre kicking waste of time and deserve to get an unpaid item strike if they fail to go through with the transaction. If they do it more than once and sellers issue the strike they deserve then I won't have to be bothered by them as they will be blocked, as they should be. If sellers send mutual cancellation requests they leave themselves vulnerable to the buyer choosing the wrong response so you lose the fvf refund and more to the point they can still leave you neg feedback! I would not trust someone who was numpty enough to buy something they did not want to do the right thing.