I don't see a standard 90 day certificate in the phrase "even shorter-lived certificates." If it was a 90 day certificate, it wouldn't be shorter-lived. It seem

I don't see a standard 90 day certificate in the phrase "even shorter-lived certificates." If it was a 90 day certificate, it wouldn't be shorter-lived. It seems to me Let's Encrypt was referring to the possibility of exactly what you asked for, separately from revocation.