C'est réglé merci !
Le crontab avait fait son travail, mais nginx n'a jamais été reload avec, bizarre.
2022-12-30 07:18:45,993:DEBUG:certbot.display.util:Notifying user:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2022-12-30 07:18:45,993:DEBUG:certbot.display.util:Notifying user: The following certificates are not due for renewal yet:
2022-12-30 07:18:45,993:DEBUG:certbot.display.util:Notifying user: /etc/letsencrypt/live/diagno6.net/fullchain.pem expires on 2023-02-14 (skipped)
2022-12-30 07:18:45,994:DEBUG:certbot.display.util:Notifying user: No renewals were attempted.
2022-12-30 07:18:45,994:DEBUG:certbot.display.util:Notifying user: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -