It was already out of date when published in Feb 2022: > PostgreSQL has built in support for UUIDv4 through the pgcrypto or the uuid-ossp extensions. PostgreS

It was already out of date when published in Feb 2022: > PostgreSQL has built in support for UUIDv4 through the pgcrypto or the uuid-ossp extensions. PostgreSQL hasn't needed an extension to generate UUIDv4 since v13 which was released in Sep 2020.