I wonder how much of the efficiency increase comes from simply bypassing photosynthesis (e.g. what is the thermodynamic efficiency of yeast for glucose -> ethan

I wonder how much of the efficiency increase comes from simply bypassing photosynthesis (e.g. what is the thermodynamic efficiency of yeast for glucose -> ethanol)? In any case there are a few important questions re feasibility. Do these bacteria work at atmospheric partial pressures of CO2? Do they perform at the advertised rate at the ~0.0015g/L of hydrogen you'd be lucky to get in solution from his leaf? Nocera is a blow hard, so pending the full paper I expect the answers aren't encouraging.