> how did we go from a faulty code

The code in the example isn't faulty. The goals are faulty in an non-obvious way, and drives the AI to optimize a solution to a fitness function in a way that humans might consider pathological behavior.

> to Comcast paving the future of the AI?

Comcast's goals are faulty in a non-obvious way. Comcast's goals are to maximize shareholder profit, and in doing so creates a culture of fraudulent billing and a horrifying gauntlet of a cancellation process that humans might consider pathological behavior. And AI is the next logical step to optimizing those corporate values.