To be honest, I have no idea. I’m using LetsEncrypt via Certbot as well and I have that file.
I wouldn’t care as long as my certificates are all valid and certbot runs without errors.
The header of the files says
# This file contains important security parameters. If you modify this file
# manually, Certbot will be unable to automatically provide future security
# updates. Instead, Certbot will print and log an error message with a path to
# the up-to-date file that you will need to refer to when manually updating
# this file.
and then mainly defines settings for the following parameters:
- SSLProtocol
- SSLCipherSuite
- SSLHonorCipherOrder
- SSLCompression
Maybe run certbot renew manually and/or have a look into /var/log/letsencrypt/letsencrypt.log to see if it complains somehow.