To me it just looks like it's too early to tell. Did quits go up very quickly in 2021? Sure! But that comes on the heels of a massive spike in layoffs that occurred in 2020. It is at least a possibility that the current situation is a response to that.

One point I didn't go into is the fact that the labor force participation rate also dropped steeply in 2020 and hasn't recovered to pre-pandemic levels yet. So that could create labor shortages that are not necessarily represented in the quits rate.