> In le figaro they report the profit is due to variation in price between the different transactions. Which seems to be a polite way to say they took exceptional risk.

Nah it's just regular realized gain (delta between acquisition price and selling price).

https://www.banque-france.fr/fr/actualites/resultats-2025-de...

(so it's kinda irrelevant, it's just they have to put it in their books)