It took a bit of dig but they were acquired by Google. https://www.crunchbase.com/organization/qwiklabs. Strange that they haven't fully assimilated their stack / org into Google / GCP proper.
Edit: seems like they were acquired in 2016. On the one hand, it seems unacceptable that this team is going rogue and autonomous in 2023. Disclaimer: I worked at Google acquiree and worked on projects to integrate into Google proper. On the other hand, they must be frustrated with all the redtape of GCP. Disclaimer: I worked on GCP and also worked with the docs org there. The GCP docs org was the most toxic, incompetent and difficult people to work with during my time at Google. It would not surprise me if they were gatekeeping and blocking on this initiative. They ignored user feedback, and also shutdown any feedback from GCP developers and people who actually used and understood the product.