The Sirius interviewers were awful, but this is on Louis' team. The dude has a reputation for this, so they'd have anticipated these Qs (and they'd clearly blacklisted the topics they wished to truly avoid). So this is his team's PR strategy in action. Also, Louis had talking points prepared like mentioning the birthday. And he followed up by posting the baby chair. I think he didn't expect that bone-headed tactic about his mom, but again: he was set up for that.