It has been stated, but last time I checked it was lie. The flu kills more people of you compare all flu deaths in all categories and add estimated flu deaths (not just confirmed).
The best data summary I’ve seen [1] suggests that COVID-19 IFR for kids is 0.01% or less which is in line with the COVID-19 stats you cite. The same data summary [1] suggests that flu IFR for kids is probably the same order of magnitude but not “vastly less”.
I think COVID-19 vs. flu has gotten way too much press though and it’s worth noting that IFR in kids is low for both relative to IFR in adults. What I would really want to learn more about are the long-term effects of disease and how that varies by age. We know a bit about that for flu or polio or RSV but not so much for COVID-19 because it’s still so new.