This is an odd debate. Let's say a restaurant declares "veterans eat free." This blog post is like a friend telling you "Hey if you tell this restaurant you're a vet they'll give you a free meal." No one said it's legal or ethical. It's lying to trick someone into giving you something at their expense.

I think the relevant point, underscored by the author's last sentence, is it doesn't matter who you open a back door for - it opens the possibility for anyone to barge through.