I'm about 80% sure that what he really meant to write was "Where did the old mysql extension go?"
This is not a well written question by any standard. Even allowing for the likelihood that English is probably not his first language, it's just really really low effort and doesn't bother to show any work done before hand.
@kboyd Names, email addresses, and anything that can be used for identification are always changed in these posts. #noDoxxing
@pollita still, I'm impressed he was able to get a real, working example.com email address.