I think his intention is to improve and change how service is carried out, I don’t think he meant it would be instantaneous immediately after his tweet.
Did they arrange for another car for you of some sort though, your post implies they didn’t get you a car at all. ?
I’m not sure the price you paid for the car would have anything to do with the cost to replace the tires. I’m pretty sure it’s not Tesla’s fault you popped two tires, and while it totally sucks that your new car is already in the shop, it sounds like your blaming this whole inconvenience on Tesla.
I’m not sure they are at fault for this break down.
It would have been nice if they had stock of the tires, that likely would have been quicker, but you still may have needed a loaner anyway, if the service centre was busy.
Hang in there, I’m sure you’ll have the car back soon.