So, you don't think there's a difference between any game involving risk/death, and actual survival games like Stranded Deep or The Long Dark? Games where survival is the entire task - find the resources needed (food, water, medicine to maintain your health, shelter & clothing to protect from the elements, etc) to survive is literally the entire game. As opposed to an RPG where you're interacting with people/making decisions/playing a story/etc, where the basics of "survive" are guaranteed if it weren't for the fact you deliberately seek out danger (questing/adventuring). Or an ARPG like Diablo, where sure - you need to not die - but the GOAL isn't "survive" it's kill stuff/level up/TREASURE!
"Zombies" doesn't make a game or movie automatically "horror", any more than two characters having a relationship automatically makes a movie a romance. You do understand, for instance, that Alien and Aliens are two different genres of movies, right? One is a Suspense/Thriller, the other is a Miltary/Action movie?
(Also, saying "Fallout isn't a Survival Horror game" doesn't mean I think it is/should be a rainbow-filled walk in the mall with puppies. Genre has little to do with difficulty - you can have a super-easy Survival Horror game or a super-hard one. You can have a super-easy Sports game, or a super-hard one. You can have a super-easy RPG or a super-hard one. Genre has no bearing on that. Survival Horror is a specifically-defined genre of games - which I'm guessing you didn't follow that link to look at the article about it - with an array of characteristics that Fallout does not have.)
...really, your insistance that every game is a Survival game because you can die, ranks right up there with the people saying every game is an RPG because "hey, you're playing a Role! Whether it's a character you made, or Mario jumping on platforms, it's still a role!"