IMO there's a difference between the vibe coded one-shot projects (which tend to have those AI generated looking websites), and using LLMs for targeted and focussed suggestions. The contents of that file and a quick skim of the PRs and commits doesn't change my mind on that, the project still looks like it's made by competent developers who may or may not use AI for debugging/brainstorming.
I know some people will still prefer having zero AI usage and that's fine too. For me their AI use doesn't meet the threshold for me to have doubts about the quality and longevity of the product.
I also found this: their website / blog uses the Eleventy static site generator: https://github.com/bonfire-networks/website-blog