Here's their reply on this issue
Thank you for your continued correspondence.
Please be advise that writing fake or paid reviews is a violation and is not a good practice for business. Endorsements and testimonials must be truthful and should not be misleading.
So composing a product review without purchasing and test the product yourself will fall under the term of fake and paid reviews.
How many of you actually buy and review the product yourself?
So for all AMAZON affiliates, you need to buy the product first before you write any review. It's not even April yet.