The "G" in the PEG ratio represents projected earnings growth, not "vehicle deliveries growth" or "revenue growth". For now (and for at least a couple years), earnings should grow much quicker than revenue and/or vehicle deliveries. I don't know Tesla's earnings growth rate off the top of my head (I think it's currently much closer to 300%, not 50%!), but I believe
@Gigapress may have a usable earnings growth rate in one of his posts on his substack.
EDIT: I just pulled up Net Income for Q3 2021 compared to Q3 2022, here are the numbers:
Q32021: $1.62 Billion
Q32022: $3.29 Billion
Thus, the current earnings growth rate is 3.29/1.62 - 100% = 103%. Normally, I wouldn't expect such a high growth to continue into the future; however, Tesla's past year's difficulties with chip shortage, covid shutdowns, etc make it possible for Tesla to continue with such a high earnings rate for the next four quarters (i.e. - 3.29 * 2.03 = $6.67 Billion net income in Q3 2023).