Who altered Δ Hidden Forbidden Holy Ground and removed Aura's Statue?
The creators of R:2 would have been the people to modify the area after the destruction of the original game. IPO I would think it was Piroshi specifically because of something he mentions about graphics the first time you meet him at the area. However... I think there's more to it than that.

https://www.youtube.com/watch?v=qtBW_liXkt4