I think copying a website like this is very poor taste regardless. If I see you doing this, I immediately lose trust in your product and will immediately leave.
If you can't put the effort into the face of your product, how can I trust you to put effort into the product itself? Shitty behavior, with a shitty justification self-affirmation blogpost.
I think the author's choice of words is framing the discussion. They did build their own website, but they loved the look of the one they saw, so I'd think a better choice would be "inspired by" rather than "stolen from."
I agree. It's telling that they picked such a boring and generic design to steal.