Probably not. Letsencrypt don't provide a way to tell them "I'm not using this certificate any more", so they send out so many false-positive warnings that the

Probably not. Letsencrypt don't provide a way to tell them "I'm not using this certificate any more", so they send out so many false-positive warnings that they're likely to drown out any signal. Every time I move a service to a machine using a different letsencrypt account, or add a domain to a certificate, I get an unactionable warning email.