This was a private gig, hosted by Spotify, at the Cannes Lions International Festival Of Creativity. Apparently, that is some sort of advertising conference/festival.
The show was unknown to the general public/Beck fans, until a few clips and things ended up on social media while it was happening.
I still don't know much about it, but Beck performed alone without his band. The two clips I've seen were of the songs on the setlist below.