This sounds made up.
I purchased a song on iTunes a long time ago, during the time that an Apple ID was required to unlock access to the file. I lost access to the associated email address and Apple ID password. I don’t want to steal a song that I morally own. How do I unlock the file without the Apple ID password?
You can’t steal something you already own. Just download an unencrypted copy. There is nothing morally questionable about that.
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For what its worth to OP you might want to look at what laws apply in your area. Many countries may indeed be okay with you downloading a song you already own (as per transiet punk) BUT be against you breaking copyright protection (decrypting it).
Yeah, I had a de-gooogled android ROM that wouldn’t allow me to verify that I had in fact bought an app. So I just downloaded the unlocked apk and it just works.