I'm a little bit annoyed at reading about details that seem closely connected to internal code (e.g. CheckConfigModel classes) without being able to see the sou

I'm a little bit annoyed at reading about details that seem closely connected to internal code (e.g. CheckConfigModel classes) without being able to see the source. I am not sure what others find so compelling about this blog post. Granted it's from Airbnb which probably has one of the more interesting data sets, but honestly it looks to me like an internal blog post that's been reposted to Medium without considering the viewpoint of an external user. I understand if they don't want to open source the framework; but then most of the blog post should be about design principles, maybe a bit about the process itself — not implementation details that seem directed towards an internal audience.