As that isn't an advertised favour to keep certain members sweet from what I've seen I imagine the loophole will disappear as soon as the IT department eventually get around to fixing it.....which could be some time.
Strange to think a Gold member has to pay £35 for a redeposit of 4,500 Avios while a Blue card holder can have 100,000 redeposited for just a few dollars. BA must be losing thousands.