Sellers can manipulate the feedback removal option.
I'll be in the phone to eBay as a seller issued a partial refund for an item I wished to return. The seller claimed it had been returned missing parts which is an absolute lie as the item & label hasn't been dispatched back to seller yet. The seller even messaged me saying, keep the item after they'd marked as returned.
It appears eBay aren't allowing buyers to leave honest reviews.