Well, as a thought experiment, I'd say that depends on if the measure is "1.3M lines of production code" or "1.3M lines of code (test code, comments and production code combined)".

I don't think you could get to 1.3M lines of production code, but people say AI agents are good at writing tests. I could imagine that if you had an unlimited budget you could set up agents to generate lots and lots of tests and comments, inflating your weekly total. Like, maybe you can set up an agent to loop against a code coverage tool trying to generate more and more tests to hit MC / DC levels of testing.

In the extreme / absurd case, if you could hit the SQLite ratio of 590x lines of test code vs real code then 25,000 lines of code per week could be 43 lines of production code and 24,958 lines of test code.

You'd be a "100x programmer" in terms of lines of code output, but that would not get you to SystemD levels of production code in a year.

I can't point you to a project taking that route, and I don't have the budget to try it, but I can imagine someone hitting 25k lines of code per week with lots of tests and comments padding the numbers.

I am not sure software written that way would be any good though.