It's funny that it complains about all of the right stuff (except the 'int' thing), but it doesn't say anything about the concept.
About the 'int' literal (which is not a string): cppreference.com has a description on this page about it, ctrl+f "multicharacter literal".
The first argument is more or less understandable (still wrong): you can't just propel yourself upwards at your earliest convenience to reach the moon, you have to play around with orbital mechanics.
If your friend's idea of a moon-worthy vessel is an unsteerable rocket with infinite fuel and a chair strapped to it... well the odds are effectively zero.
The second argument? bro, last time I checked the moon was still orbiting Earth