Article 10a, which contains the upload moderation plan, states that these technologies would be expected “to detect, prior to transmission, the dissemination of known child sexual abuse material or of new child sexual abuse material.”
This is what I guessed the other day when a post here didn't clarify what the censorship meant.
While I'm not a fan of this stupid regulation, it doesn't sound like being the armageddon that turns e2ee into ashes.
(Given that Signal doesn't like it, I might be wrong though.)
As long as we trust, say, Signal, it will possibly be able to do the scan without sending a good chunk of the image data that the user is sending. URLs can be hashed before sending it to the scanner.
The remaining piece for privacy is to use open source and to guarantee that the binaries are free of modification from the original. This problem always existed on the Apple ecosystem btw.