lol it's funny, all of the articles I see about this game mention that it's a "Zombie MMO" in the title. Like, I get that it was suggested that it would be, but it's objectively not.
In this particular instance the journalists are doing their job. It was advertised as an MMO. They could change it to "so-called zombie MMO" or something, but that wouldn't be as neutral as the current title.
It still calls itself an MMO in its Steam description:
The Day Before offers players a uniquely reimagined journey into post-apocalyptic open-world MMO survival set in the present day on the US East Coast following a deadly pandemic.