I think the author made a lot of good points. But, to play with words here - I think this is strongly against living a "designer lifestyle" rather than "designing your own lifestyle", if that makes sense? As he says at the end "Design your life, definitely. But forget lifestyle design." I think the fault lies in desiring these fancy things others have (or pretend to have) just because they are marketed as luxurious - whether it's worldly travel and 4 hour work weeks, or material things like designer clothing.
Financial independence, in and of itself, is not a lifestyle. It manifests in some common ways, but there's also a vibe around the community that's much more live-the-life-you-want than this-is-how-you-should-live. There's a lot more cost/benefit analysis than what you see in other "lifestyle design". And I think that individual tailoring, the fact that FI is a tool and not the sole goal, helps balance the approach.