Question about ojs/registry/scheduledTasks.xml

Still having troubles getting my usage stats to evaluate through cronjobs, I was reading some of the related sources (branch stable-3_4_0).

I notice in ojs/registry/scheduledTasks.xml the section:

<task class="APP\tasks\UsageStatsLoader">
		<descr>Process the usage stats logs and load the numbers into the DB tables.</descr>
		<frequency day="0"/>

However in ScheduledTaskHelper.php it is compared with the output of date('j') - which to my knowledge can never be 0.

Could it be this was a typo and it should be * instead of 0?