What the hacker saw:
U there?
Who U?
I’m me
OK, LOL!
Not from my reading of the exploit potential. The most they might get is any images you may have sent in the recent past to the person youre currently texting, or any recent exterior links to a website to that person. The current texts themselves are sent with 256 bit AES encryption, which is unbreakable.
Hackers would not find my iMessages very interesting either.