Including Ancient (regardless of its current health bonus state, it can receive another bonus), Ironmight, and Volcanic, regardless of their current health bonuses.
Health bonuses do not apply to shields.
This is a quick, easy way to implement a "waller" or "tank" type playstyle without much thought or work. The current plate armors are currently weak in their defenses due to a lowered special defense. It would also keep each armor unique in their original designs, because it is a universal health bonus without the intent of normalizing everything
If Chaos armor is getting buffed for the "glass cannon" playstyle, then the "waller" or "tank" (not sure if "tank" applies to this game, with no agro tables and all) should receive some attention in my opinion, just to even stuff out :/
No idea why they'd needlessly buff Chaos to be what it was intended to be when most armours in the game aren't what they intended them to be.