Not true. I quote from Apple’s press release: “Apple is integrating ChatGPT access into experiences within iOS 18, iPadOS 18, and macOS Sequoia, allowing users to access its expertise — as well as its image- and document-understanding capabilities — without needing to jump between tools.”

You will be prompted and asked if you’d like to share, but once you choose to share, ChatGPT will have access to the photos you share.

ChatGPT cannot analyze a photo without having access to it.