i am an antinatalist, and i want to become vegan soon; hopefully, I can accomplish that before 2024.
I'd disagree with you on one logically leading to the other, since antinatalism is about not having kid as so to free them from suffering, and veganism may have several justifications, such as health benefits of not eating meat and moral arguments (freeing animals from pain). And even if I choose to be vegan based on the moral arguments, yet, again, antinatalism is about not having kids in order to spare them of the suffering of living, and veganism is about not eating meals that come from means that cause suffering to animals in order to spare some animals of the pain.
I can see how an antinatalist person can become veganism over time since both are attempting to aliviate pain in the world. I myself have been an antinatalist for too long, but just now decided to pursue veganism.
1, veganism is not plant-based eating. Veganism is a philosophy, an ethical and moral stance.
2, veganism and antinatalism overlap, become vegans know that breeding animals (especially for personal usage) is unethical, and causes suffering. Antinatalist know that breeding (mainly for humans) is unethical and immoral.
The core belief/hole of both is basically that suffering is bad, and we have to prevent suffering somehow.
3, suffering begins with sentience. Without sentience there's no suffering. Most animals and people are sentient beings who have the ability to suffer.
4, if an animal or a person haven't been birthed (this sentence sounds shitty so I probably fcked up something) they wouldn't be suffering, therefore the suffering could've been prevented by not bringing the offspring to life.
I hope this rambling made sense, feel free to ask for clarification or to criticize my points, but this is how I see it and that's why I believe that the two overlap.
Also, best wishes on becoming vegan