Even if it does mean he did and keep in mind how bad he sounds and all tech on the planet is completely fucked in that ending - so presumably that includes medical tech - and included being ejected forcefully from the Citadel there somehow - yea, Shep's a badass but he's survived thanks to tech before including some that was required to keep him alive after the intro to 2 - and with no tech working, that seems like just the last few breaths off of life support to me, its one of 4 options to potentially be canon whenever they'd go past it in the timeline.
Again, just my own feelings - I've stopped quoting family. (Not that any are currently involved with the PC gaming industry - last was with Asheron's Call - which was a decade ago now, right?)