I have no idea.
In the latest report on cases following vaccination, from the 30 days prior to January 17th, there were a total of 61 hospital admissions for 17 and under: https://i.imgur.com/hSIOmjB.png
The OHA report on hospital capacity as of January 24th has listed 9 kids in the ICU with COVID-Related Critical Illness: https://i.imgur.com/eYumxI3.png
I'd like to see David Fisman's sources/graphs too, but knowing him, he's cherry picking or overreacting or presenting the data in a sensationalist way.