They give both in this report, and GAAP first, why the complaint?

GAAP can give an inaccurate picture so management can give non GAAP numbers to show how they see things. They still have to produce GAAP figures as well by law. Or:

>Management also believes that presentation of the non-GAAP financial measures provides useful information to our investors regarding our financial condition and results of operations because it allows investors greater transparency to the information used by Tesla management in its financial and operational decision-making so that investors can see through the eyes of Tesla management regarding important financial metrics that Tesla management uses to run the business as well as allows investors to better understand Tesla’s performance.

as they put it