Years ago, we had to be towed off of a hard (sand) grounding- 6 kts- , and subsequent inspection out-of-water showed zero damage. If I am seeing/understanding the video this boat has physical keel damage part way up the leading edge, and perhaps it collided with something hard like a rock ledge or a structure, at speed.
EY boats are quite tough, and it takes quite a knock to damage one.
That would be an insured repair, and should have been arranged for and paid for already. (?)
No matter what the present (and highly variable) market price might be, that boat would be a 50K (minimum) investment IMHO. And, insured appropriately.
Something Fishy about it, indeed!
The broker, now that this video is public, will have a major liability issue unless they are forthright about the condition of it, too. And, the seller.
As for the initial price, the seller can insist on whatever price they want, but it's up to the broker to agree and take the listing, at a price they can live with. (IMHO)