It is often closed for maintenance in the winter but never so early or potentially for so long
https://actu.fr/societe/occitanie-le-canal-du-midi-sera-ferme-a-la-navigation-beaucoup-plus-longtemps-cet-hiver_60253277.html
https://www.thelocal.fr/20230313/famous-canal-du-midi-stays-closed-amid-water-level-fears-in-france