When people say "billionaire" in this line of comments they are trying to point out the perceived hypocrisy that Noam is likely VERY well off... even having a few million dollars can set your family up for life. You are immediately in the top 1% in the US which puts you even higher anywhere else in the globe.
Noam could never pick up a job again and he will have likely made more money than the average US worker will in their lifetime.
His observation of scorn at employees who are well-compensated NOT jumping at the opportunity to work weekends to get something done for users is a sign of privilege (and probably also a sign of his drive, which is commendable) and maybe a little lack of empathy.
