I can’t find any source that attributes over 60,000 deaths to the flu in France in January 2017. In fact, that’s close to 4x the most commonly reported figures for the whole 2016/2017 flu season in France. What numbers are you basing that claim on?
> En outre, l’épidémie de grippe hivernale amorcée fin 2016 a entraîné un pic de décès exceptionnel en janvier 2017 : 67 000 décès en France métropolitaine ce mois-ci.
I disagree with your reading. Specifically, it doesn't say that 67,000 people died of the flu, it says that 67,000 people died. The entire report is about all-cause mortality, and so is that sentence. The flu was the reason for a spike in deaths, but it was not the cause of all 67,000 deaths in France that month.
What I believe to be a more accurate translation:
"In addition, the winter flu epidemic that began at the end of 2016 led to an exceptional peak in deaths in January 2017: 67,000 deaths in mainland France this month."
