It depends how one measure it. If you look at the total output if GitHub in a year and try to poorly extrapolate how much code is written in a year - and then Anthropic measures how much code their system spewed out, then sure maybe they emit 90% of the estimated total amount of code. But most people wouldn't define it that way.
Maybe that's why the models are so eager to spit out reams and reams of code, it lets their masters claim a higher percentage (even if most of the code they emit is never used).