As said, the seller cannot say you took ages to pay

That comes under 'false positive'

An if the buyer reports it, eBay will remove the comment and slap the seller

Feedback can for buyers can only be a green tick, with 'good words'

Sellers know that buyers can only ever have good things said about them, or nothing at all

No matter how long they took to pay/did'nt pay at all/opened false claims or anything else you can think of