Tootles FTW wrote...
There is no survival confirmation - Bioware has said that it can be taken as a breath from Shepard "waking up" or Shepard's last breath. They vagued it up on purpose because they want speculations.
This was all stated at a panel during some convention...too lazy to look up a link, my apologies.
Yes and no. Narratively the only real explanation for that scene to exist is to surprise players that Shepard is alive. We also have confirmation that the difference in the memorial scene is supposed to reflect the scenario where Shepard is alive, per Tully Ackland:
"You may notice that in the “Shepard lives” ending, the love interest
hesitates to place Shepard’s name on the wall, and instead looks up as
though deep in thought. This is meant to suggest that the love interest
is not ready to believe Shepard is dead, and the final scene reveals
they are correct. As the Normandy lifts off, there is hope that the love
interest and Shepard will again be together."
So, while Destroyers who want Shepard to be sacrificed can technically still headcanon this, formalistically his survival is the only plausible conclusion.