Can't scrape metadata on wills arcade set v3.3

[Fable Son]

Hey all.

I'm trying to add metadata to wills arcade set v3.3 on my Pi3B image. I found a guide in here that I followed. But nothing happens.
Am I doing something wrong? Or is it something in Will's that needs to be changede to make it work?

This is the guide I followed:
http://forum.attractmode.org/index.php?topic=1665.0

Thanks in advance