It's a product that offers a vibe coding service to users. You enter a text prompt for what you want to build (no-code), and it tries to build it.

I don't know if these 8 people vibe coded the vibe coding product itself -- they may have. But in the title the reference to "vibe coder" refers to their product.

> vibe coding means what here

It means you tell the product what you want and it gives you the code.