I think this very well could be a lie.
Blaming a former employee looks much less bad on Betcoin than a third party gaining access. Also, Betcoin has a history of telling blatant lies both big and small. (Including lying about having a "new start, new owners etc", multiple times, in order to blame past scandals on someone else)
I can definitely see where your coming from, but given that PlayBetr/Coinbet were also breached (and any other sites using the same software), it's harder to believe. I suppose the argument could be made that they are all the same site but I think it's more likely that they're just using the same provider.