This is stupid. Anyone interested in writing jailbreaks for iOS would have already had access to these binaries. People are blowing this way out of proportion.
not true. 64-bit kernel was previously not possible to examine.
additionally: we now know what Watchtower looks like, something that was previously a mystery and even incorrectly thought to be something that ran on SEP instead of the AP.
That gets you a kernel dump, a decrypted kernelcache gives you very handy MachO headers. And as Will said, the well known kernel dumping methods do not dump Watchtower. I'm not sure if anyone has privately been able to dump Watchtower with a kernel privsec or if it has only been possible with the kernelcache keys.
additionally: we now know what Watchtower looks like, something that was previously a mystery and even incorrectly thought to be something that ran on SEP instead of the AP.