Actually, just out of curiosity, I found the original module:
http://modarchive.org/index.php?request=view_by_moduleid&query=135454.
The one put "as mine" seems to have the comments removed and it's saved as a .IT (the original one is a .XM). The original author seems to be "Daniel Alcala" (with nick "Trackman") -to whom I don't know personally-, and regarding the comments, it was published in the very old Spanish magazine "PCMania" (which used to come with CDs or floppy disks filled with modules and demos)
It may have been my mistake... I had some modules I stored around to rip samples from, and I may have uploaded it somewhere without noticing (maybe doing some batch upload it may have been among my modules). If that was the case, I don't know where... it would have been almost 20 years ago! :-)
The author's e-mail is a college one, I'd bet he's not there anymore to contact him :-)
Ah, anyway, I'll look if other collections have it listed as mine and notify them :-)
Thanks for everything!