Well, if you are a renter, your counter party is not the hotel (Disney). Your counter party is the owner member, and David's as an intermediary.
For David's, I don't think they are on the hook for anything based on this language. "David’s Vacation Club Rentals is not liable for any operations changes by the Disney Vacation Club with respect to where you have booked your travel. This would include but is not limited to operations of resort restaurants, pools, play grounds and other amenities controlled by the Resort." However, if they don't help the renter, their reputation is ruined and they won't exist for much longer.
For the owner, I don't think they are on the hook either based on this language. "This is an agreement to rent points that represent accommodations only.""Should accommodations not be available on date of arrival due to an action or omission by the Owner, including but not limited to negligence on the part of the Owner and after communication with the Intermediary, suitable comparable accommodations for the same dates cannot be secured by the Owner, the Renter will be due a refund limited to the amount paid". The renter got the points. The accommodation was not available not due to action or omission but he owner. The renter can use the points to make another accommodation reservation, but no refund. Well, and the fact that no refund has been mentioned numerous times in the contract. That's the way I read it.
The renters rented points that representation accommodations only. I think there is a strong argument that in the current situation the renter will gets the points - and the underlying restrictions behind those points - to make another reservation. They were advised to purchase
travel insurance. There is a type of travel insurance that will cover this situation - cancel at any time.
So, I think David's has a strong case to defend a chargeback. Now, will the average credit card charge back investigator understand all this. I doubt it, and I think a lot of them will just rule for the credit card holder since that's ultimately their customer. I am just saying don't be so confident about it. If you initiate a charge back and fail, you burn the bridge and David's will have no incentive to help you secure another reservation.