I hate to be cynical, but I'm sure many of my ancestors were also told to believe similar things. I know for certain that my grandparents and great grandparents believed that technology would create such progress that people of my generation would not have to work, and all would have leisure time.
AI is more likely to evolve into a tool to be used by the few to control the many.
Framed in the way that the article presents the data, then, yes, I guess, we do have more leisure time. Although, how much? The article cites that the number of hours worked per week (since 1900!!) has only dropped 1.4 hours a week. Or, extending it out and assuming that the trend is linear, the typical American can expect to finally have 100% leisure time sometime around 4516 AD.
But, then also consider that many of us are working (i.e. as in 'working for the man') many more hours than our parents did in fields that require significantly more focus, concentration, and mental energy. Even the article notes that people have been facing increasing stress and feelings of being rushed since 1900 and 1965.
Maybe you're in a cushy field. But, most people that I know only have time for 'zoning out' and recovery, rather than in pursuit of true leisure.
AI is more likely to evolve into a tool to be used by the few to control the many.