I've had this multiple times.

Tried to leave a big detailed helpful negative review and it gets flagged for being suspicious, with no copy of the review attached so I have to write it all again. And then it gets removed again.

I just looked in my emails. The exact phrasing was "We have reviewed our decisions and concluded that the product you received is authentic. As a result, we removed your review specific to this product. This ensures other customers see reviews that reflect the current shopping experience."

Most recently it happened with a body trimmer, where I never questioned the inauthenticity, and then a zojirushi travel mug that I genuinely believe was a fake, and attached a lot of evidence.