GOTD Boss Health Pool

I’ve just returned to Destiny after a year off. I’ve solo flawless’d every dungeon so far, just got the mechanics down for the final boss. After one phase I’ve wiped and done 2m damage. And it looked about a sixth of the health bar.

I’m sure I’ve read elsewhere that she got nerfed to 7 million health. Is that not true of a solo run?

Thanks guys!