Log: Deleted.
Strange wpsecure include files generated at /usr/local/nginx/conf/wpincludes/yourdomain.com/wpsecure_yourdomain.com.conf would already have that line by default. How was wordpress installed ? you did modifications to default install ?
oh then that explains it wpsecure didn't always have those lines for letsencrypt and centmin mod doesn't change existing wpsecure files so as to not override users customisations etc