Its a shit article with Tech crunch changing the words to get people in a flap about AI (for or against), the actual quote is

“I’d say maybe 20 percent, 30 percent of the code that is inside of our repos today and some of our projects are probably all written by software”

“Written by software” reasonably included machine refactored code, automatically generated boilerplate and things generated by AI assistants. Through that lens 20% doesnt seem crazy.