Again, if Tri-Borg isn't canon because he "hasn't been part of the story yet" what does that say for the 20 or so characters Raiden erased in mk9? Is Hotaru still canon?
Literally everyone in the series is in MKDe Konquest, and most of them played at least a tiny role in Armageddon. But again, if all that matters is story / game canon none of that happened. Those characters are as canon as Tri-Borg and Kratos.
It says nothing because characters were not "erased." Hotaru is indeed still canon.
The events of
Mortal Kombat: Deception and
Mortal Kombat: Armageddon did indeed happen, which caused Dark Raiden to send his memories back to his past self, creating an alternate timeline as Raiden continued to act differently.
All of those characters are not magically "erased," because they're existence was not created by Raiden encountering them. We simply have not encountered all of them in the current timeline, and different fates have befallen many of them.
They are canonical characters, as of this typing Triborg is not.