You misunderstood the comment - they mean the team working for Musk making claims about fraud (and yes, plenty has been written in the media, and in HN threads, about them being mostly young men), not that people claiming benefits are young.

I'm not misunderstanding anything, lol, this whole subthread is pretty wild though. Nobody introduced young benefit claimants anywhere into the discussion.

Original comment:

Which of these scenarios is more likely: The government is paying claims for people who are 150 years old [or sentinel values]

Followed by a claim that Musk's young employees have argued for "the former" i.e. that the government is paying claims for people who are 150 years old. Nobody is 150 years old, so we know it's not the first scenario. Moreover nobody - not Musk and not anyone working for him - has claimed that such people exist or they're receiving money. The claim has always been from the start that the data quality is very low and a possible reason for this (or effect of this) is fraud.

Also, sentinel values aren't the correct answer, as established by Musk himself in a followup. The argument that these guys don't understand the basics of databases was always extremely unlikely and was indeed proven false within hours.