This is true for almost all labor "shortages" when there is anything less than full employment. If you struggle to find workers at a given wage, you're not paying enough. It's not like the world is out of people.

A true labor shortage could exist without full employment with ramp up time issues with skilled labor. That also means a shortage across the whole scope not just a single employer. As in "even if you paid a million a year salary you couldn't suddenly get 100 people capable of proficently reading and writing a long dead language when there are only seventeen professors world wide who can". The issues would correct themselves eventually longer term with sustained demand and training though.

There's a difference though. The news stories you're reading are about employees that are offering pay that's at a similar rate as unemployment benefits.

Workers are not OK working on slave wages that these employees want to pay them.