Isn’t this like a self fulfilling prophecy in a way in the comics Superman dies to doomsday but he wins the fight but because Batman believes it to be the elden lord and now so does Superman they both now believe that Superman dies by the elden lords hand
now that i remembered the phoenix is after him because he represents life just like her, so it wouldn't be strange to say that phoenix is in love with finding another like her, and jean gray is "dead" i'm the only one who's seeing phoenix wearing it jean as your avatar to go after mc?
if my guess is correct then the ultimate is one from Fate the Ultimate of Venus, Mars, or even Cell Moon those are extraterrestrial and destroyed worlds before.