Under normal circumstances that is probably true. I'm guessing that Amazon shields your CC info from the sellers. Or more likely, the contractor that handles the banking does so. However, in the case of one listing I saw, that seller, probably an illegitimate seller who had hacked a legitimate seller's account, wanted direct contact before sealing the deal through Amazon. I would not be surprised if that likely illegitimate seller wanted to get the buyer's CC info. Amazon can shield buyers through the normal processes, but not if the buyer is ignorant enough to allow an illegitimate seller to deal with them outside of the safe buying zone.

Also note that the hackers were able to hack into the legitimate sellers' CC information. That might mean they only got the legitimate sellers' CC account info into which they accept payment from Amazon, or perhaps it means something else and more sinister. I hope it means they only got the legitimate sellers' CC info and/or replaced same with their own banking account info.