In "War of the Daleks" (novel) it was revealed that the Hand of Omega had not destroyed Skaro. The Doctor cot the co-ordinates for Skaro in "Destiny of the Daleks". But that planet was not Skaro, but another planet called Antalin where the Daleks had moved Davros to. Both the Doctor and Davros thought that Antalin really was Skaro. The Hand of Omega destroyed Antalin.