I agree, mistakes do happen, esp. from newbies but that doesn't mean they should be condoned. My low powered negative vote would work as a good symbolic reminder for him to not to repeat such a mistake in future. And it's more imperative from a person who is professionally qualified in agriculture with a keen interest in sustainable food. He should also understand the gravity of offending sentiments of vegan readers with a blatantly non-vegetarian post.
However, thanks for bringing my attention to it again. I have noted that the author has edited the post to make necessary correction and I've revoked my DV. I guess, that's what you wanted to convey to me.
Thanks a lot sir for understanding me🙏