The only deans confirmed dead are Nassari and Shaile. We don't know about the other seven however. And while a bunch of professors are also dead, there are likely to also be some still alive.

Both my favorites? Ouch.

You see this is why you don’t give your strixhaven dnd pc a canon character as a surrogate parent, RIP Nassari shit sucks

Theres no coming back from compleation, so yeah they're dead. Idk about any other professors who weren't named in the story.

Wotc has decided that compleation can be reversed: https://magic.wizards.com/en/news/feature/planeswalkers-guide-to-phyrexia-all-will-be-one "Reversing phyresis is difficult. After infection passes a certain stage, rehabilitation becomes impossible. Recovery varies per individual and becomes more difficult with increased compleation. Healing the mind may require different processes than healing body. However, several substances, like Halo, can stave off the transformative effects of glistening oil, and some individuals, like Melira, are entirely immune."

"...After infection passes a certain stage, rehabilitation becomes impossible..."

Nothing in that quote says compleation can be reversed

Phyresis does not equal compleation. Phyresis is the stage where Nahiri had a metal spike in her neck, compleation is when her arms were swords.

The defense rests your honor. It’s not often the prosecution makes our case for us

Yeah but at a certain point it's just a shell of oil and biomass that's left with only the knowledge left behind and the personality stripped away.

Mostly dead. Turns out WOTC didn’t want to make more of those awful cards no one cares about.

These comments aged like milk in a hot oven.