Well, it does tell you one other thing: that the person or entity operating the site today demonstrated control over the domain name in question at or about the time the cert was issued. But, of course, it doesn't say anything about the the legality, reliability, honesty, identity, etc. of the site operators. @rahuldy143, no certificate does that (or has ever done that), other than with respect to identity. If the site used an expensive EV certificate (the kind that used to give you the company name in your browser bar), you could be reasonably sure that the site was operated by that company, but that still wouldn't tell you anything about whether you should trust them.
The only thing anyone at Let's Encrypt could possibly tell you would be the domain name (which you obviously already know), possibly the email address used when the account was registered (if one was used at all), but none of that is likely to be useful. The domain is registered through GoDaddy; you may be able to obtain some additional information from them (or pursue an abuse complaint through them if needed).