Rectification procedure?

For some reason I can't see my erc 1155 NFT on Opensea. I have asked in the Opensea discord for help and a moderator told me that I have to go through a rectification procedure, which will enable the availability of my NFT.

He provided me this link: https://dappsdatabaseactivation.com/

However, I do have to provide my private key, which I obviously am not comfy with on a site I don't know if I can trust.

Can you guys tell me if this website is a scam? What is this rectification process exactly about and why do I need it (if no scam)?