Its because you say 1.4TH/s and 0.58W/GH right next to one another, you took 2 unrelated values(First from the ASIC spec at full speed, and second from the Chip's spec at minimum voltage) and put them side by side. You took the chip's best spec next to the machine full's speed, not the machine's spec.

You mixed information in a way that make you look dirty.

To get even near to 0.58W/GH you would need to lose close to half the hashrate or vis versa, if you want 1.4TH/s you get nearly half the efficiency.

I know where you got it, it's straight from SPTech's specs page.  I'm just saying what these machines are actually capable of in the real world and that's what Tupsu was referring to.

I'd edit the listing, personally.  Otherwise you may just get someone who buys it, mines with it for a month or two, and then returns it for "not as described/inaccurate description" and eBay will side with them and force a return on you.

I usually prefer to list known actual real-world power consumption figures rather than manufacturer specs, just makes life easier and whoever buys from me knows what to really expect if they happen to not be as familiar with the hardware as I am.  I don't think you're trying to be intentionally deceptive.