Again, the premise was that phpMyAdmin is secured behind basic auth. It doesn't matter how secure or insecure phpMyAdmin is, it only matters how secure whatever webserver is that it is served through. phpMyAdmin code isn't even touched before the basic auth login was successful. Only after that, it becomes relevant, in that you either find a hole in phpMyAdmin itself, or you have to break another (hopefully strong) password for the MySQL login itself.