This is the assumption that he would have sold the bitcoin then at that time .123btc still = .123btc. Do I scream bullshit about buying 333 mega hash miners at 1btc each? No because at the time I was willing to pay it, I don't assume I would have held on to those coins and sold at some mystic time.
The assumption is that if he didn't buy this unit he would have bought something else. At the same time for the same exchange rate. Its a fair and solid assumption. You have no reason to argue this. Why do you continually defend this company, even when you have no ground to stand on?