No, the data definitely doesn’t support your position. Going vegan absolutely makes a hell of a lot of difference, even from just one person doing it.
https://thehumaneleague.org.uk/article/how-many-animals-can-you-save-by-going-vegan
Going vegan doesn’t mean you are saving animals. Without your demand for meat they would never get born in the first place. So not eating something that doesn’t get born doesn’t mean you saved them from being eaten. Just imagine how much potato milk I saved from being consumed, by not consuming potato milk.
Now you’re just grasping at semantics. Aside from the fact that vegans have promoted a way of life that led to the creation of animal sanctuaries, which literally does save animals lives; obviously abstaining from behavior that causes sentient, feeling, thinking beings to be actively bred into existence for the purpose of suffering their whole short lives for someone’s fleeting sensory pleasure makes a real difference. I believe I’ve already linked you to an article elsewhere, showing that even one person going vegan absolutely makes a difference.
You know, that’s kinda the point. You are reducing suffering. The hypothetical animal not born is one less animal suffering. It’s not necessarily only about saving them from being eaten.
If you can’t stop eating meat, buy from sources where they care for the animals and give them good life for the time they are alive. It’s not vegan, but you still reduce suffering. It’s not perfect, but it is a valid alternative.