I got a response from a gm saying it will become available with the next patch. Apparently they'd added it at some point and then removed it again because I've seen some people who have it. This whole thing is pretty ridiculous seeing as all the other 18 gear has been available all this time for alliance and it makes no sense whatsoever to only not offer the protector's band. And if they're gonna remove it they should also remove it from those who'd already bought it.
Feel free to bump this thread with some other 19 twinking bugs:
https://forum.nostalrius.org/viewtopic.php?f=76&t=28770About time those get fixed.