Also worth mentioning that universities generally see themselves as research facilities first and foremost. They teach students, because they want to get the next generation of researchers.
Sure, they'll also do job training to some degree, because it's a good argument to get more funding, but yeah, just not their primary goal.
I imagine, this is more about software devs than sysadmins. Sure, you'll hire a couple more sysadmins to help with the massive user growth during the pandemic. But especially combined with loans basically being made free in the same time, it's suddenly worth hiring a bunch of devs to build the Next Big Thing™.
Once those loans start costing again and the user numbers fall off, you quickly have lots of devs that you can't find tasks for, that are worth doing.