I do not at all believe this is unique to the Tik-Tok generation.
> As well after Covid things are different like people don't and don't want to work as hard as they use to.
Do you have any evidence beyond anecdata for this assertion? My understanding is the "great resignation" was people upping their salary requirements, basically the willingness to break your body and soul for pennies is significantly lessened. In other words, minimum wage labor became more scarce and/or just more expensive. Are you willing to work for half of your current pay? If you were, would you work less hard?
For the knowledge that we do have, per the person being fired, they were a diligent worker. Seemingly to have done pretty well after a short ramp-up period even. This is why the firing is an even bigger kick in the nuts, she worked hard, was praised for that hard work by her manager, and then HR comes in and says she was not doing well at all. I would turn this around a bit, perhaps the older generation feels entitled that they can treat people like this.