Let's Encrypt SSL's aren't issued like normal SSL's, they are "generated" on the web server itself typically using their kit.
I believe they are asking to have the "kit" built into Chevereto to allow the SSL to be generated and then automatically renewed, however I don't see that being within scope at all.
I believe they are asking to have the "kit" built into Chevereto to allow the SSL to be generated and then automatically renewed, however I don't see that being within scope at all.