The article conflates productivity with 'working hard'. Productivity is a measure of how much value is produced ('money is made') per hour of work.
A bulldozer operator working an 8 hour day to move a few tons of dirt is more productive than a worker who needs many 12 hour work days to move the same amount of dirt with a shovel and wheelbarrow. A trader at a bank who moves millions of shares with a phone call and a few mouse clicks is more productive than the bulldozer operator. Does this mean the banker works hardest and the guy with the shovel the least hard?
A high productivity per hour in a country means fewer ditches are dug using shovels, and more credit default swaps are sold. It doesn't mean people are working harder. It also doesn't necessarily mean the shovel digging country is organizing its economy less efficiently. Where the cost of labor is a few dollar per day, investing in a bulldozer might never pay off. Hiring 100 guys with shovels and wheelbarrows could be more efficient than hiring one guy with a bulldozer.