You are right about that. Getting consistent answers from Tesla sales or support is tough. At times, I feel like they make up answers on the fly
In my opinion, they are misleading you. The price on your order can't go up after you placed the order and paid the $2,500. What they are implying (I think) is that if you don't take delivery when the car is ready, they could cancel your order and you will have to place a new order at the new price. But I haven't heard about anyone's order getting canceled because they had to postpone delivery by a couple of weeks. They just remove the original VIN assignment and look for a new assignment. The original order isn't canceled. At least that's my impression hanging around this forum for the past 6-9 months.