His/her question is good, and the summary is incomplete. It converts CO2 to CH3CH2OH at a yield of about 63%, but what CO2 concentration in the water are they assuming? Average soda concentration is about 0.12-0.15 M (moles per liter) at about 4 bar. That would mean you'd get 0.05 M alcohol (2 carbons per EtOH from one carbon in CO2, 0.5*0.63*0.15), which is 0.05 moles EtOH/55.5 moles water or about 0.08 percent alcohol by volume. That's a lot less than the ethanol conversion you'd get from corn.
It did not mention the catalyst materials cost, nor the materials processing required to make a nanomaterial.
So we'd have energy costs by compressing CO2, then converting it using the catalyst, then there would be ethanol separation costs (with requisite electricity/natural gas from the distillation columns) from water that far exceed normal ethanol separation, and the ethanol would still have about 10% water because it is an azeotrope,so then you'd need another liquid-liquid extraction...
As is the case with the other carbon dioxide conversion schemes, it's really cool chemistry, looks good in summary, but the details render it ineffective for practical use.