Because the DNA SPlicers were made for Kyurem and the rest of the legendary Tao trio. In BW2 you see that Kyurem uses it to activate the ability to turn Reshiram/Zekrom into their stone form and then absorb them. This probably works because Kyurem, Reshiram, and Zekrom were originally one Pokemon. This is unlike other trios/duos.
So no, the Splicers will not work on any other Pokemon.