The parent point isn't that shitty code doesn't have defects but rather that there's usually a big gap between the code (and any defects in that code) and the actual service or product that's being provided.
Most companies have no relation between their code and their products at all - a major food conglomerate will have hundreds or thousands of IT personnel and no direct link between defects in their business process automation code (which is the #1 employment of developers) and the quality of their products.
For companies where the product does have some tech component (e.g. refrigerators mentioned above) again, I'd bet that most of that companies developers don't work on any code that's intended to be in the product, in such a company there simply is far more programming work outside of that product than inside of one. The companies making a software-first product (like startups on hackernews) where a software defect implies a product defect are an exception, not the mainstream.
Most companies have no relation between their code and their products at all - a major food conglomerate will have hundreds or thousands of IT personnel and no direct link between defects in their business process automation code (which is the #1 employment of developers) and the quality of their products.
For companies where the product does have some tech component (e.g. refrigerators mentioned above) again, I'd bet that most of that companies developers don't work on any code that's intended to be in the product, in such a company there simply is far more programming work outside of that product than inside of one. The companies making a software-first product (like startups on hackernews) where a software defect implies a product defect are an exception, not the mainstream.