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It's a top end race frame and bonkers thin in places. I can't see the frame escaping undamaged from an impact that broke the fork. Stranger things have happened I guess.
If you can borrow a headset and fork from someone you'd at least be able to test it all out without sinking any money in to it. The headset is integrated so if it has had a frontal you'll know pretty quickly as the bearings won't sit right and it will creak like fuck.
Seems to be mostly car/mtb stuff-difficult to say really, but positive feedback so I'm hesitant to say it's not legit or that it's fucked till I get it in my hands and have a gander.
Lots of folk buy CAADs as frame only and retrofit groups/componenents and my old alu Colnago CX frame with similar reinforced downtube has been through the wars and is totally fine-the steel mech hanger however cracked and left the stay totally undamaged so I don't think there's quite the same risk as there is with carbon. It'll either be warped and cracked or it won't?