It would have been surprising not to see it on the list given other contemporary reports on the incidents.
I note that some AR-15 clones such as Olympic Arms are not on the list.
The generic M-16 is a fully automatic (machine gun and burst fire) extended variant of the generic AR-15. AR-15s can be converted to full auto with a few specially manufactured parts (including perhaps most prominently something called a "sear"). Those parts are strictly regulated by the fed. gov. and regarded legally as equivalent to machine guns. I believe the presence or absence of the machine gun related parts do not affect the ballistics.
Barrel twist for the AR-15 family are: 1/8 (modern AR-15 type); 1/9 (modern), and longer (1/10, 1/12, 1/14) (not modern and less common). 1/12 was the original twist but the bullets tumbled with the low twist rate so they upped the twist in subsequent models. 1/7 is another possibility but it is more of a specialty, for use with special bullets.
I don't know what the Thompson Contender barrel twist(s) are (anyone out there?).
Missing from the list are some non-AR-15 guns capable of firing the .223, such as the Thompson Contender.
I myself am not a weapons expert or a LEO, just an interested reader of current events news (so if someone corrects something in the above, it is very possible he or she has the better poop than I do on it).
I see the list is dated Oct. 4 (a week ago) so there could be some internal updates to it that we in the general public are not yet privy to.
It would be handy to have a single generic web site where all the known and publicly released facts are available. If this doesn't exist, perhaps it is to some degree telling about how much or how little law enforcement agencies trust and/or have confidence in the helpfulness of the general public.