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I don't believe it either but they probably meant 30% of the code committed not of their total codebase.

By trying to understand, I believe you are expending more thought and effort by far than was made to make the statement.

If any line of any codebase was written by AI, then up to 30% can be true, in the way that my ISP will claim ~900 Mbps still qualifies as up to 2 Gbps.

It doesn’t have to be contiguous AI-written chunks. This could also mean X% accepted AI suggestions on Y% codebase where X*Y < 30%.

AI suggestions can also be as simple as autocomplete and still be counted for the sake of engagement metrics.

Oh and in enterprise settings and especially MS shops Github Copilot is being pushed everywhere, (forceful) adoption rates are much higher than the market average.

Right, they're not going to want to risk breaking legacy application behavior.