@Rizwan Basir:
Thanks for the example but it looks like scratches, not the paint peeling.
@Sheryl John:
My S7 edge has been repaired and is on its way back to me. Should receive it tomorrow. My carrier made me send it to a third party repair service, partner of the carrier as well as Samsung (called w-support.com in case you're interested). They repaired it free of charge because of warranty. I asked if it'll be waterproof afterwards and they said yes of course. Otherwise my phone wouldn't pass the check before being sent back to me. They also sent me a pdf file of the final check. I trust them that it'll still be waterproof since w-support is a trusted partner of Samsung. But just like before the repair I won't check the waterproofing on purpose. If it happens, it happens.
Will keep you posted how the repair turned out and if everything is okay once I receive it