Sorry, so it was only 11 years for them to restore the functionality that Siri in effect "took away" in 2010.
The only way to get it back for those 11 years was to disable Siri entirely, meaning you had to be "cloud dependent" or stick to that unchanging set of offline-only features exclusively for a decade. Not a lot for the Siri team to be proud of there.
I just tested this with Wi-Fi and cellular data disabled. Calling someone works perfectly and asking to turn Wi-Fi on presents the relevant toggle.