Reasons they listed for going to the moon seem pretty weak. Need expert opinion on their lander/engine tech for I am no rocket scientist. I find very interestin

Reasons they listed for going to the moon seem pretty weak. Need expert opinion on their lander/engine tech for I am no rocket scientist. I find very interesting use of word "proprietary" in design of their lander, why would they emphasize that? All that said I applaud all and any efforts to advance space technologies.