Maybe I'm missing something here, but why on earth is anyone giving credence to entirely unsubstantiated claims being spun up in these paranoid blogs. There is no reason to believe that any of this bears any relation to actual policy, past, present or future.
Thanks, but doesn't change anything. An implosion system is designed to achieve a critical mass, but the result of achieving criticality is a radiation-pressure-driven explosion. Critical masses do not implode.