After last night's cron jobs:
-rw-r--r-- 1 root users 0 Jun 23 22:01 simple-test.txt
So the /usr/bin/touch command on line 7, that I put in /etc/cron.d/openmediavault-rsync ran, but the cron job on line 6 still did not. Nothing other than the simple-test.txt file seems to have been touched. And I still did not receive any email notification for that job.