I am highly skeptical of any claims that something 'magically just works' without much configuration or setup.
The blog post is meant as a high-level introduction for a general audience. The documentation (https://antithesis.com/docs/) goes into considerably more detail about what kind of configuration and setup you need to start testing with Antithesis.
I am highly skeptical of any claims that something 'magically just works' without much configuration or setup.