example zero-downtime ab output does not match description

[trel]

In the section for
https://github.com/vincetse/docker-compose-zero-downtime-deployment#demo-zero-downtime-deploymentsh

The description says

You will see that ab does not emit a line about Non-2xx responses, which means that all requests completed successfully.

But the ab paste below is identical to the one from the section above with 767 failed requests.