As is typical of such articles, this is written from the point of view of a central bank. Low inflation is only a problem to central banks. Central bankers are bothered by low inflation because they can't cut interest rates below zero. The US and Europe inject money into the economy by having the central banks loan it out to commercial banks, who then loan it out at a profit. That's not the only way to do things. Japan uses large government-funded infrastructure projects to pump money into the economy.

The real problem is "secular stagnation". We just don't need that many people to make all the stuff. The US now has a huge population that's irrelevant, and acts as a dead weight dragging down wages. I've been saying this for over a decade, and it's now conventional wisdom, although it took way too long.