Well, its great that they are communicating, but they owe you a car, and money. Here is from Tesla's contract:
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Delivery. We will notify you in advance of the date your Vehicle is expected to be ready for delivery at your local Tesla Service Center, or other location as we may otherwise agree to, and unless we are in breach of this Agreement, you hereby agree to schedule and take delivery of your Vehicle within one week of this date. If you are unable to take delivery within the specified period, please contact us to request additional time, which we may grant at our sole discretion. If you are unable to take delivery within the specified period, including any extension we may grant, you will be in breach of this Agreement, your deposit will not be refunded pursuant to the “Status of Your Deposit” paragraphs above, and the Vehicle will be made available for sale to other customers. If, on your behalf, we are coordinating the shipping of the Vehicle to you via a third party common carrier, you hereby agree and acknowledge that delivery of the Vehicle, including the transfer of title and risk of loss, will occur at the time your Vehicle is loaded onto the common carrier’s transport (i.e., FOB shipping point). The carrier will insure your Vehicle while in transit and you will be the beneficiary of any claims for damage to the vehicle or losses occurring while the vehicle is in the possession of a common carrier. To secure your final payment and performance under the terms of this Agreement, you give us a security interest in the Vehicle and all proceeds therefrom until your obligations herein have been fulfilled.
The bold is my emphasis. They are in breach of contract. They have acted as if they loaded it on a carrier to book the sale - thus you own it, and if anything happens to it, it's on you and your insurance until it gets on the truck.
It is scary reading this. It seems they intentionally broke the law to book the sale. In essence the order of events should be that the driver receives the car on your behalf (by signing for it) and loads the truck (Shipper is now insuring it for transport) while at the same time Tesla can legally book the sale and you are the legal owner. So if it falls of the truck, the shipper insurance pays you, not Tesla.
If you have a friendly lawyer, I'd ask for a favor about this.