I think it's a side text which Kishi wrote. Sasuke doesn't have time to think of a name to his jutsus and most importantly, he doesn't give a fvck about being Indra. That's how his character is.
You new to Manga? In the beginning of every chapter of Naruto there are messages written by the author, and are not meant to be taken as lines from characters.
It's either author side text, or Sasuke inherited knowledge of Indra from the Yin chakra. He wouldn't attribute a technique to someone he doesn't care about unless he knew it was already their technique.
Everything suggests Indra had this technique. What kind of writing would it be if Indra didn't have it?