Wasn't it entrapment anyway seeing as how the FBI already knew the answer to the question Flynn lied about? they were basically setting him up to lie given that they'd manufactured a Russia conspiracy that nobody would want to admit to being associated with.
To me with it just reads like a subtle dig at Barron probably aimed at Trump, listing their similar ages as if to compare them. Private = not doing anything of note and then talking about what the other kid has done at a similar age.