If there is any truth to the alleged potential attack as the blog poster stated, the end could have been horrendous (but not discounting the horror of 149 innocents plummeting to their deaths). Flight path appears to have flown right over the string of plants, and might have significance considering the flight veered off normal flight path and into the mountains.
I searched the web about threats to French nuclear plants, found nothing.
(imho) finding nothing may not be insignificant ...