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OP has got 200 years of experience under their belt now.

That's a FAANG level resume right there

50x more code? Absolutely plausible. 50x more ideas implemented, or 50x better ideas? Doubtful. Generating code doesn't generate value.

He was just not doing his job 95% of the time.

In a sense, yes. If you compare how long it would take me to do it manually about 15 years ago.