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"Set to the sound of Emi Evans’ incredible Ending Theme"
Not quite. The Chaos Language version is sung and had it's "words" written by Emi Evans. The Japanese language version was sung by Marina Kawano and had it's words written (I think) by Keiichi Okabe. The English language version is sung by and had it's lyrics written by J'Nique Nicole. In all cases the music was Keiichi Okabe.
The version in the final end credits is all three of those blended together, with the background choral section being people who worked on the game.
I totally agree about it being the best credits sequence of 2017 games though (if not longer). Especially with the way it uses your internet connection.