This is a myth.
In most Japanese companies, people comply with chair hours and do extra chair hours just to get their prestige up within the company without actually working. Just like in most developed countries (Sweden, Denmark, Austria) their productivity is super high and they do not require extensive work shifts, since they are already intensive.
If you ever spend a week or a month working in Japan, you will see that they may even pretend to fall asleep at work. Because somehow, that shows how committed they are to their company and work: "He was so exhausted but still he stayed working".
It's pretty common for workers there to be punctual, stay late doing extra hours (get paid extra), and then go take a couple of beers. Rinse and repeat. Of course this has to do with the deteriorated state of their social interaction which is another subject.
Countries like Mexico, Costa Rica actually have the highest working hours average per week. Highest of the OECD iirc.
Japan ranks even under the USA and Canada. These are hard numbers.
But of course the person who wrote that article, probably watches anime and admires his niisan too much to actually research something before writing a bullshit article.