I can run ME files just fine in MZ myself with Soundtrack Manager active, so if there's a bug I can't reproduce it. I think Robro33 might have been trying to run the MV version of Soundtrack Manager through FOSSIL? Maybe? I don't really go out of my way to support FOSSIL; maybe it works and maybe it doesn't, but that shouldn't be relevant if you're using the MZ version of the plugin anyway.
That or he's referring to the other plugin.