It just can't be true - it would raise hell within the old community who's got lots of coins already.
No one would be pleased if his coins he'd mined ages ago are suddenly destroyed.
Maybe if they don't comply with contributing to the giveaway or something they'll have theirs destroyed.
QCN difficulty has been dropping as well, even faster. People in Quazar coin thread think someone actively mines these coins and sells them fast at exchanges to strengthen Monero.
This seems a more likely reason for BCN difficulty to drop than this nonsense rumour about destruction of BCN.