Zend certified PHP/Magento developer

How is this Windows program ignoring my output redirection?

This program Lunar IPS (which create binary patch files) is seemingly ignoring my redirection to null. I’m invoking:

"Lunar IPS" -CreateIPS output.ips input1.txt input2.txt > nul 2>&1

And it gives me a load of output anyway:

Original file: input1.txt
Modified file: input2.txt
Patch Creation Complete! : The IPS patch was successfully created!

I want to know either how to do this myself, or (preferably) how to prevent this program from ignoring my redirection.

Note that compared to other similar questions, this one actually does try redirecting both stdout and stderr.