There's quite a lot of missing freqs from the list but I appreciate the author may not be an aero nut so that could be why. I listen to the HF aero bands a lot and can add the following freqs. I'm uncertain on the official area code designation for some of them and the info doesn't seem to get published anywhere either (at least not in recent years).
For the NAT, Shanwick now has RDARA freqs at their disposal in addition to the main MWARA ones. These are used on a as-and-when-required basis by Shanwick ONLY :
RDARA NAT-H
2965 3491 (also shared with Santa Maria), 5583 6556 6667 (also shared with Santa Maria), 10021 10036 11363
RDARA NAT-I
2860 2881 2890 3458 3473 (shows in list for NAT-J as well), 3488 5484 5568 6550 6595 10066
RDARA NAT-J
2869 2944 2992 3446 3473 (shows in list for NAT-I as well), 4651 4666 4684 5460 5481 5559 5577 6547 8843 8954 11276
I notice you don't show Africa on the wiki and perhaps for good reason as it's extremely hard to figure out what the situation is there these days. I have noted activity on the following :
5517 AFI-4 Mogadishu (night time). Seems to be the night freq equivalent of 11300
8873 Niamey
8888 N'Djamena
8894 Algiers, Niamey, Nouckchott
8903 Brazzaville, Accra, Niamey
11300 AFI-4 Mogadishu, Khartoum, Cairo, Tripoli, Seychelles, Asmara, Addis
13288 AFI-4 Mogadishu
In the South Atlantic you are missing 6649 and 10096 which are Atlantico's night and day primary freqs . Recife radio doesn't exist by name - they have been called Atlantico for as long as I can remember.
In the Indian ocean on INO-1 (Arabian Sea) you have freqs 3476 5658 6661 8879 10018 10084 with Mumbai on all. 5658 and 10018 also see Delhi, Karachi and Kabul and I've heard all 4 stations recently. On 8879 you also have Brisbane, Seychelles, Beira and Sana'a - again all heard recently. 8909 is also Mumbai for Indian AF, Navy and Coastguard, and also serves as secondary freq for Chennai military on 8861 (see below).
On the other side in the Bay of Bengal in the current freq use is :
Kolkata : 3485, 6556, 10066. I don't know about 13318 and 17907 but Kolkata doesn't use 3470, 5670, 6556 or 11285 !
Chennai & Colombo : 3470, 5670, 11285 (dunno about higher freqs, never heard them used)
The Indian AF, Navy and Coastguard use 8861 exclusively, mainly working Chennai but Port Blair and Kolkata can also be heard infrequently. 8861 is also used primarily for flights to and from Port Blair to/from the north. 8909 is the daytime back-up freq for the military.
The current SEA-2 freqs for the South China Sea changed a couple of years ago. All of Singapore FIR to Vietnam is now covered by long range VHF. The only flights you'll hear working Singapore are the ones to the Philippines and East Malaysia. Pretty much everything is on 6556 with only the occasional flight on 8942 if they are unreachable on 6556. Manila uses 8942 primary and 5655 secondary. You never hear them on any of the lower or higher freqs listed.