The real problem is with lower skilled positions. Either people in easier roles or more junior people. We will end up with a significant percent of the population who are unemployable because we lack positions commensurate with their skills.
But, the study is also about LLMs currently impacting wages and hours. We're still in the process of creating targeted models for many domains. It's entirely possible the customer representatives and clerks will start to be replaced in part by AI tools. It also seems that the current increase in work could mean that headcount is kept flat, which is great for a business, but bad for employment.
I think skills in using ai to augment work will become just a new form of literacy.