Curious if any LE certs were generated by successfully impersonating domain registry's during these ccTLD hijacks
Given, the attack was not at CA level, but successful DCV using registry impersonations. LE is not likely not liable for certs issued. But being a free CA, LE would be what would be used by most criminals.
Yes, certificates for Google and Youtube were issued, and have been revoked. You can find the revoked certificates in our CRLs, if you're so interested.