I honestly don't even think this is the case. IMO I think editorial basically told him "here's your cast, make them miserable because once Hickman arrives none of it matters anyway." It's possible that maybe they said "keep Wolverine and Cyclops alive for the finale" but that's about it.
I honestly think what's about to happen is going to mess with a lot of the Xmen universe in good and bad ways in the fan's eyes. Even though I just said "they'll all be back" I certainly fear it will because ten years from now someone is going to need some good storyline ideas and they'll want to cash in on people who miss people like Magik and Havok.