It does seem they're trying to get out of it somehow.
There was a dispute about whether the amount awarded was confidential or not (Uber contended it was; plaintiff contended it wasn't), but on the face of it, had plaintiff agreed to the confidentiality and non-disparagement clauses, Uber would have paid up.
I suppose it could be argued that Uber were trying to write in clauses they knew plaintiff wouldn't agree to, but it's not obvious to me that a different plaintiff wouldn't have agreed to confidentiality and non-disparagement.
(FWIW, it's not clear to me whether Uber have now in fact paid up; they made a statement to the Guardian that _suggests_ they have, but the fact that they didn't explicitly say so means I wouldn't want to draw that inference)
It's minor, but they are not accepting the award as-is, they are still trying to negotiating, albeit in a minor way, not by contesting the amount, but a confidentiality clause.
They love to negotiate confidentiality clauses, there's few cases without it, including a case by Mike Rafi's personal injury firm which resulted from an omission by Uber (and later Uber being much more anal about confidentiality). I think it's a strategy to avoid case law catching on.