Ask HN: Did the Bloomberg's story “The Big Hack” happen?

In 2018 bloomberg posted an article[0] revealing how China infiltrated america's top companies hardware with micro chips. Most of the companies named in the article denied it and called for retraction, Apple even wrote a letter to congress. But bloomberg still sticks to the story.

What really happened?

[0] https://www.bloomberg.com/news/features/2018-10-04/the-big-hack-how-china-used-a-tiny-chip-to-infiltrate-america-s-top-companies