oops, I’m using the SQL plugin from MBS, as it by far faster … 
… so I really don’t know. From the timestamp the documentation seems to be up2date.
Perhaps this will help: MySQLCommunityServer — Xojo documentation
It is written for mySQLServer, but I just tried for postgres and you have the same parameters:
And perhaps this thread is useful as well: MariaDB 10.4 SSL connection error: protocol version mismatch