Track World Championships - I’ve never seen this

I was looking through Instagram and so this picture of Chloe Dygert Owen riding around the track in Berlin. And it seems that her drivetrain is on the left side of the bike.

Any ideas why?

Launched some time ago (in advance of Rio):


in essence its more aerodynamic, if you want full info look it up. marginal gains and all

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ALSO HOLY CRAP THAT WOMENS INDIVIDUAL PURSUIT. no spoilers just go watch it if you havent yet