I did indeed err in the attribution. Please accept my apology.
Here is a link to the full article that is more permanent than the one you showed.
Eurocockpit - Archives
It appears the original French indicated "0,5 dixièmes de degré" which surely looks like an awkward way of saying 0.05 degrees or 3 minutes of angle. The plane appears to be well within that error band.
JD-EE