I feel that you've missed the joke. Also, there is no way, at all, that they are going to revoke nearly all of their certs because they were valid for 1 second longer than they should have been. It would mark the end of Let's Encrypt if they did.
We've lived with certs that were valid for a second longer than they should have been since the inception of Let's Encrypt, and three months won't kill anyone.
edit follows:
When they revoked 3% of their certificates, not all of them were able to renew in time due to physical server limitations. The renewals required server administrators to forcibly renew their certificates, and the email address associated with the certificate was contacted to let them know. It would be an unmitigated disaster if 185 million certificates were suddenly revoked.
(Replying to PARENT post)
We've lived with certs that were valid for a second longer than they should have been since the inception of Let's Encrypt, and three months won't kill anyone.
edit follows:
When they revoked 3% of their certificates, not all of them were able to renew in time due to physical server limitations. The renewals required server administrators to forcibly renew their certificates, and the email address associated with the certificate was contacted to let them know. It would be an unmitigated disaster if 185 million certificates were suddenly revoked.