The chart is wrong in that the French Barracuda also relies on a pump-jet propulsor instead of a conventional screw type propeller. Australia’s comparison of the two subs likely showed that it was the competing German pump-jet propulsor that was not as quiet as the French model. In addition, the French proposal offered a newer sub design than the Germans, with the Barracuda being based on the new French nuclear sub, with further customization pledged to meet Australian needs. Finally, French scientific and technical competence should not be underestimated. When important national objectives are at stake, the French these days tend to get their act together.
They have good engineers and the French sub fleet is a force to reckon.
That being said, I believe their latest nuke attack sub was so small they had to miniaturize the reactor which created usability and maintenance nightmare.