Still - after being reminded of how Fiverr reacts to this sort of thing, I would be hesitant. If reviews are mentioned at all in private conversation through Fiverr, you could be at risk.
I once had a buyer leave me 2.7 stars, but it was clearly an accident. His brief review was nice, but he left zero stars under service as described. Knowing that it could potentially hurt my ranking if I filed a request to change my review, I sent him a message about it. He was extremely apologetic and cooperative, asked me straight up how he could change it, and I told him he’d have to file a request. He did, sent me a screenshot of his request, and guess what happened?
Fiverr rebuked me for “asking” him to change his review (I didn’t - he insisted and asked how he could do it), and put a warning on my account. I went back and forth with CS and they eventually removed the warning, but in the end, they still basically told me that I was out of line and was breaking ToS.
Since then, I have never once mentioned the word “review,” “star,” etc. in any Fiverr conversations because I’m terrified of what could come of it.