And the way they verify you are doing what you say you are doing is by asking you to provide evidence, which is usually pretty easy to demonstrate that a policy was followed once or twice, a lot harder for them to pick up consistency issues or exceptions.
I've had SOC2 auditors choose a random commit from our GitHub history, then ask to see the associated Jira ticket, logs from the build and deployment, etc. Hard to reliably pass an audit if you don't know which changes they'll drill down into.
They also asked for proof of system-enforced processes (e.g. GitHub branch protection rules and the setting for enforcing peer review for each change) which were basically proof of consistency.