Board Thread:Naruto Discussions/@comment-28414362-20150812151040

It's said that Hamura and Hagoromo used this technique to defeat Kaguya (Ten-Tails). But actually, they didn't seal Kaguya into moon, but into Hagoromo. It was Hagoromo who later used Chibaku Tensei to seal rest of Ten Tails into moon.

So as they didn't seal Kaguya/Ten-Tails with Chibaku Tensei into moon, they didn't use this, but rather Six Paths Seal. 