What should I do? floating interest rate on new construction

[West Kite]

I have a question. If a buyer is offered a 2-1 buydown (starting at 5.25%, increasing to 6.25% and then to 7.25%) with all closing costs covered except for $3,000 (to be paid by the buyer) on new construction through the seller's preferred lender, and signs the purchase contract in April 2024, the house will be completed by the end of September 2024. The buyer was informed that the interest rate will be floating because the construction completion date is further away (5 months) according to the preferred lender. They mentioned that the rate will be higher if locked for 5-6 months. Is this normal in lending? Would you leave it as a floating rate, hoping the rate goes down? Of course, no one knows for sure, but it seems the FED deferred interest rate decreased.

The location of the new construction is so appealing due to being close to downtown (10 minutes).

What would you do?

Thank you for your input in advance.