In your example, say the comedian is testing the joke on a new demographic (christian vs. jewish, say), so the epsilon in this case is not just the substitution of a word in the joke but also testing the joke on a new "market".
On the one hand, I think there's a place for giving credit to the original source and even having things fall under (some limited form of) copyright. On the other hand, I also see the need for experimentation and freedom to use ideas, which aren't and shouldn't be copyrighted.
Wikipedia wasn't the only internet encyclopedia, it just happened to be the one that "won". Maybe there was a reason why Wikipedia won on merit but random chance was, no doubt, a big part in it.
Relying too heavily on the novelty of ideas prevents experimentation.
However, that's not really my primary issue with this article, as I've said in a couple other comments here, my issue is that 'the epsilon method' itself is not a new idea or concept. Both 'copying' and 'copying with slight differences' are already well known by everyone everywhere. So much so that there are whole bodies of law that attempt to define when its ok and when it isn't. The article is presenting this as a novel and insightful idea when it is not.
Note that this is also in the context of startup culture and a pushback to the 'zero-to-one' idea, so in that sense it's novelty is highly context dependent.
Also, although blatant copying in the writing/art/music is bad, in business it can be fine. If someone in my local area decided to open up a coffee shop or auto repair garage that were basically copies of other like businesses elsewhere, that would be fine; the 'epsilon' being they use a different name and branding. If that's the advice, its fine advice. What rubs me the wrong way is that it seems that the article is advising blatant copying but in giving it a cover to seem like its not. If the advice is to copy other successful businesses, then just say that. This doesn't need to be given a fancy name like 'the epsilon method' as if its some new innovative concept. Copying (with slight differences) is not a new idea. People know about copying already.
Not to say small incremental improvements aren't good or worthy of businesses, I'm not. I think those are good and worthy. But the size and nature of the epsilon does matter because if the change isn't significant, then the result is effectively just a copy.