Thanks for posting this link. Its actually a pretty good article how it talks about all the different coins that were possible to mine with a 280X starting with Bitcoin itself all the way to Zcash.
One issue with the article is most likely the power consumption figures, they seem a bit low. I don't know how the test rig was measured in calculating power consumption but it should almost be double of what is shown.
When I mined ETH in 2016, my hashrate was 20MH/s and my power consumption at the wall was like 200Watts with each GPU undervolted. I am assuming he used GPU-z which is not accurate to measure power consumption.
Power consumption is taken of the whole test stand minus power consumption in idle mode. there may be a mistake due to the low efficiency of my bronze 1200W power supply while operating at minimum power.