I don't remember that this map pack was ever used officially for Feral-heart, but there may be a chance that it was included in FH+ (I've never used FH+, so I wouldn't know). If you believe that Tigg created Silent Lakes, there's a chance that she also had some involvement in the other map creations. I'll browse around to see if I can finding anything, and I'll let you know if I come across something.