I agree with @sjprior - the list in the original tweet doesn’t sound like the org has shifted much to the left. Nothing wrong with that, but the expectations are going to be very different depending on how far to the left an org has shifted.
In my current team, we’re running most everything in containers, using mocks for dependent services, so you can generally spin up the world and test features locally. As @ola.sundin said, the feature appears to work as expected and doesn’t break anything. There’s also the expectation of unit and integration tests that verify the feature is working as expected.
We don’t actually have much manual testing these days - our test engineers might add a few e2e tests once they’ve reviewed the unit/integration tests that were added.