Clearly, you skipped the last paragraph.
Also, I've pugged 9/12 HC a few times. It's a 9yr old expansion with scripted bosses that do the same thing every time you engage them, on timers. Believe it or not, there are people that can manage to remember a boss fight longer than 30 seconds and some of them are on this server.
HC Gunship has 277HC offhand, 277HC chest, and 277HC cloak - EASILY puggable every week
HC Marrowgar has 277HC boots, and 277HC ring - This fight is not much different on HC
HC Festergut has 277HC mainhand and 277HC legs - Same fight as reg with more damage
HC Bloodqueen only gives a 264HC wep and 264HC ranged in 10 and nothing in 25 - Included as another HC farmable boss
If you can do those on normal, you can do those on HC. 1/3 of ICC is basic.
There's also Ruby Sanctum for easy 271NM and 284HC items. It's literally moving in a circle around the boss, stacked with everyone else that's slowly moving, and avoiding the obvious fire on the ground. He's a rogue, that's all he does that fight.
Again, refer to the 1st line of this post to cover the other 284's.