@Christopher685 Yes, his review will show up 14 days after checkout. It does not matter whether you leave a review or not.
Please do leave your honest review with your bad experience. It helps other hosts when the guest books again. You may write the review on the 14th day if you think that his review may be negative and affect your booking.
If you find his review has false and misleading information, you can always ask Airbnb to remove it even though the successful rate is very low. But this will help Airbnb to realize that their bad decision in allowing retaliatory review takes a lot of their resource.