What sampling method did they use to arrive at this estimate? What is the error range and 95/99% confidence intervals? I haven't been able to find the original report online.
From some articles: The commission found evidence of 2,900 to 3,200 abusers – out of a total of 115,000 priests and other clerics – but said this was probably an underestimation.
We would really need to see what the method they used to arrive at the numbers - this smells like major hyperbole.
UPDATE: a better article is available in French: https://www.lefigaro.fr/actualite-france/les-cinq-chiffres-c...
The number they gave is cases over 70 years, which is a weird way of reporting it. Annually, it is about 2900-3000 priests per year. The article also mention that the current rate in about 1/4 of the rate in the 1970's, showing that some of the church reforms have actually worked. If you compare the French stats to what is being reported here, the anti-church media bias is flagrantly clear.