Does ionice also apply to i/o redirections?

A coworker recently observed a command: user@host:~$ ionice -c 3 mysqldump -uredacted -p redacted redacted > redacted.dmp Since the host in question uses the deadline scheduler anyway, ionice is ignored . However, the question was posed: Does ionice also apply to the > redirection? Does it apply to the entire command, or just the mysqldump?