I don't think it's been patched. I'm not sure if it will be either. It only works in Duviri anyway.
The only thing it is, is Chroma's 2 armor buffs working off of each other. Casting his 2 with cold element and his 3, building up armor with enemies shooting shields, resulting in the next cast of his 2 giving more armor than the first time. Then let the buff on his 3 expire, recast it and build it again, making it too stronger than the first time. Rinse and repeat. And this was with 3 ranks of the decree giving power strength with the amount of armor you have.
I suppose it could work on any frame that has 2 sources of armor that scale with power strength. Maybe with Elemental Ward subsumed? Could be interesting.