Isn't that an article about using a frontend aesthetics prompt in order to avoid the AI tells? A lot of the with-aesthetics pages look pretty good imo.
It's describing the problem and also giving a solution. The problem of vibe coded sites all looking the same is very real however, if you don't consciously and actively guide the LLM towards being different, as described in the article.
And it looks completely the same, so much so that people can tell it's AI generated now simply due to the gradient, among other design choices LLMs seem to make by default: https://prg.sh/ramblings/Why-Your-AI-Keeps-Building-the-Same...