(Updated post) i found this for $550 usd, is it good for that price? “Orica-Scott team racer with Shimano Dura Ace bits. Carbon fibre”

Looks fine from a couple blurry pics on a 4″ phone screen.

Needs a new chain (possibly drivetrain if the rusty chain has stretched and worn out other components).

No way to tell for sure unless you see it in person.