Are time zone definitions actually required/used in MySQL?

For MySQL the Django docs say:

If you plan on using Django's timezone support, use mysql_tzinfo_to_sql to load time zone tables into the MySQL database. This needs to be done just once for your MySQL server, not per database.

I can't find any evidence that Django actually uses those tables?

Here, for example, is a snippet from adapt_datetimefield_value():

        # MySQL doesn't support tz-aware datetimes
        if timezone.is_aware(value):
            if settings.USE_TZ:
                value = timezone.make_naive(value, self.connection.timezone)
            else:
                raise ValueError("MySQL backend does not support timezone-aware datetimes when USE_TZ is False.")

adapt_timefiled_value() is even simpler:

        # MySQL doesn't support tz-aware times
        if timezone.is_aware(value):
            raise ValueError("MySQL backend does not support timezone-aware times.")

What am I missing? 

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