There is a huge assumption here that productivity isn't increasing, which is false. Economic output per hour worked has been steadily increasing in every country since their respective industrial revolutions.
When you go to the source tweet, it turns out that it's comparing the developed world to the developing world. Developing economies will always grow faster, but not necessarily efficiently, because there's more low hanging fruit to pick. These low hanging fruit can be picked by throwing more people at the problem (increasing workforce participation or working longer hours).
One example is how much more time it takes to build infrastructure in America vs China. If you look at the data[0], productivity in both countries is growing at roughly the same rate. It pretty much invalidates the assertion in the blog and the source tweet.
When you go to the source tweet, it turns out that it's comparing the developed world to the developing world. Developing economies will always grow faster, but not necessarily efficiently, because there's more low hanging fruit to pick. These low hanging fruit can be picked by throwing more people at the problem (increasing workforce participation or working longer hours).
One example is how much more time it takes to build infrastructure in America vs China. If you look at the data[0], productivity in both countries is growing at roughly the same rate. It pretty much invalidates the assertion in the blog and the source tweet.
[0] https://ourworldindata.org/grapher/labor-productivity-per-ho...