I thought Armin’s parents were dead before that. I need to reread the beginning of the manga.
In the ANIME Armin’s parents died after going beyond the walls- which is ridiculous. In the manga, Armin didn’t have a grandpa, and it was his parents who were sent to remove titans from Maria as part of a way to lessen survivors- which is why he holds great contempt for the MP.
I may be highly wrong, but I doubt that couple is Armin’s parents since the whole ‘see the outside world’ thing was something the Anime put in.
Armin’s parents died after the fall of Maria.
ARMIN’S PARENTS DIED AFTER THE FALL OF MARIA.