As noted by the other investigating organization (La Quadrature du Net), the problem is worse than just the question of the algorithm implementation.
The problem is that the CNAF deliberately targets small unintentional errors rather than large-scale intentional fraud.
Why that? Because fraud is harder to detect and to prove (you have to provide evidence it was intentional).
So smaller and poorer families are disproportionately affected by the controls, because the algorithm was designed to do so. No computational adjustment can fix that: it is the initial intent that is broken.
The problem is that the CNAF deliberately targets small unintentional errors rather than large-scale intentional fraud.
Why that? Because fraud is harder to detect and to prove (you have to provide evidence it was intentional).
So smaller and poorer families are disproportionately affected by the controls, because the algorithm was designed to do so. No computational adjustment can fix that: it is the initial intent that is broken.
Source: https://www-laquadrature-net.translate.goog/2023/11/27/notat... (auto-translated in english)