His strategy" depends on many IFs
- if the price of BTC goes up
- if BFL delivers before August
- if the Mini Rig does what was promised and just works
- if the gold wouldn't have done better
- if the BTC goes up after block reward is halved
Classic rule of three, any scheme that requires more than 3 different things to happen will never work in real life.
That said, kudos for considering it anyway. I'd probably take a shot if I had that sort of cash lying around.