Source? The link you've provided doesn't say anything about it.
> While vegan science might have grounds for debate
Scientific disciplines specifically focused on veganism or vegetarianism do not exist.
Edit: It's not about nutrition; it's the ultimate hack to protect biodiversity, which is being driven to extinction by our agricultural practices, and to safeguard our society from collapse. As such, it belongs here. Lately, it seems to me to be more important than the newest JavaScript frameworks. You're welcome to spend some time in my post history and read on.