iMessage Not Private

From: https://www.apple.com/privacy/

iMessages not private

Why are the second and third lines necessary?

Here’s the original full text from that section of the site:

Messages are only seen by who you send them to.

Apple can’t read your iMessages while they’re being sent between you and the person you’re texting.

From inside jokes to invitations, a lot of life happens in text and video chats. Every blue-bubble message, picture, Animoji, and video is encrypted while being sent between devices.

Smart suggestions in Messages, like pulling up photos to send based on who you’re messaging, are all done on your device.

Why does it say “…while they’re being sent…”?

Because that’s the time they can’t read those messages. They can definitely read them after they’ve been sent and received.