I don't know about its authenticity but it looks legit. However, if you really want to try this, read everything on the link below and proceed with caution.
PS: Looks like its only for someone who has already unlocked the Bootloader of their Sirocco.
Do share screenshots and other info if you have tried this on your phone. 😁@Audioboxer
this might be of your interest. I think you already know about this.