This requirement applies to apps and libraries that use specific dependencies. If they don't include a Privacy Manifest, they may be blocked. OpenSSL is one of the 3rd party dependencies they listed.
They updated their library to adapt the new requirements in the v3.1.5000.
Your current specification is v1.1.1000, I would suggest changing it to latest v3.1.5001 and adapt the breaking changes (if any) and add a Privacy Manifest to flipper's libs if needed.
Apple created a new requirement for apps uploaded to the store after 1st May. https://developer.apple.com/support/third-party-SDK-requirements/
This requirement applies to apps and libraries that use specific dependencies. If they don't include a Privacy Manifest, they may be blocked. OpenSSL is one of the 3rd party dependencies they listed.
OpenSSL is a dependency of Flipper-Folly: https://github.com/facebook/flipper/blob/14b6931fe82a90bd78d170a2263a9ea8cbb43c97/iOS/Podspecs/Flipper-Folly.podspec#L19
They updated their library to adapt the new requirements in the v3.1.5000.
Your current specification is v1.1.1000, I would suggest changing it to latest v3.1.5001 and adapt the breaking changes (if any) and add a Privacy Manifest to flipper's libs if needed.