The main reason I found the publication interesting is because I've noticed since Covid a clear reduction in worker productivity around me and after doing a quick search on Google it looks like it's a global issue with worker productivity continuing to fall and for some countries sitting at multi decade lows. There is no way to make and clear link between the two though, because the way people work has changed and some people now work from home etc
I notice it without stats but I have performance and quality profiles/metrics for most people at work and there is a clear difference between before and after 2020. People generally just don't give a **** compared to before. I don't know how much is directly or indirectly COVID.