Right. If this is a no-brainer, the author gives no compelling evidence to support it. Show me something tied to adverse health outcomes. I mean, you're significantly more likely to step on something that punctures your foot without shoes and that's an adverse outcome with as much support (though without actual stats admittedly) as the article gives.
"Step on something that punctures your foot" indoors? Your floors must be more dangerous than mine... I think having house slippers (including a couple of extra pairs for guests) could split the difference?
I've definitely stepped on carpet tack multiple times before and stabbed my toes and heels.
But the point being, if you're not going to tie your claims to adverse health outcomes then you're not making a slam dunk claim as this author seems to think they are.