You should probably brace yourself for a C&D and/or DMCA takedown request from Apple, regardless of the actual legality of what you're doing. They won't like this.
But even then they weren't claiming it was reverse engineered material, but instead material ripped directly from Apple's copyrighted and confidential docs. I think both Apple and Github understand the boundaries of the DMCA pretty well. According to Github they haven't attempted to take down any of the following:
piemessage proxies through your own Mac though -- not some sketchy server in China. I'd imagine Apple shut down the one you linked to protect their users.
Unless it starts cocking up Apple's own systems - overloading servers, or generating significant numbers of support queries, for example I doubt they will have any problem at all
