I am not defending factory farming nor am I putting down veganism/vegetarianism but...they're using some big numbers to make it seem well thought-out but the premise makes no sense. They are not comparable things.
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It's comparing a ton of species to one. If any animal was killed at the same rate as all animals, they'd go extinct
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Humans are not bred as food.
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The vast majority of humans do not regularly reproduce.
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Humans reproduce at like 1 baby per year. That baby takes well over a decade to reach sexual maturity. Very different than any animal bred for food.
And why use this as a comparison when there's so many better ways to share the same information, anyway? Watch, I'll do it in one sentence:
An average of 2.5 animals for each human on earth are killed for food every single day.