Well, previously no CRL URL was provided within the subscriber certificates, so it seems LE wasn't compliant to begin with?
I know LE started operating CRLs for end user certs at some point, but these URIs weren't actually embedded in the certs until recently, only published on CCADB.
Edit:
According to Add ISRG Root to 360 Browser trust store - #7 by wordlesswind the CRL was never required for end user certs.. Apparently they never bothered changing their requirements, even when confronted with this. #wouldnottrust