An audiophile can be a KZ enthusiast, but not all KZ enthusiasts are audiophiles.
What I like so much about KZ is that someone new to the hobby can spend 20 bucks on a few different, completely competent (some better than competent) earphones that offer up unique signatures, say....EDR2, ED8, and ZN1 Mini. They can use their experiences with these earphones to decide what they like; big bass, balanced, treble heavy, etc. and then move up to better and more expensive products that match their preferred signature. I've got a ton of earphones that are way better than anything KZ makes, but I still enjoy their products and without them I would have spent a heck of a lot more than I have finding signatures I enjoy. More keep being added to my collection because it has become just that, a KZ collection. I collect them like someone collects National Geographic magazines (they still make those right?) or baseball cards
What I'm getting at is that KZ earphones aren't the best, definitely not, but they are a cost effective way to get into the hobby and use as a launching point to something bigger and better. I can't think of a single company off-hand that brings the same level of variety and consistency to the earphone market at ~10 USD or less per earphone. An audiophile can completely be a KZ enthusiast.