You've demonstrated in posts past that you struggle with math. You also struggle with evidence and scientific method based research and its difference between anecdotal evidence.
Further, just because the exponential growth isn't double doesn't mean it isn't exponential growth.
Every graph shows exponential growth - look at the US alone. By nature growth initially in exponential growth models appear small but can explode quickly.
So my suggestion to you is try to gain a true understanding of what you are talking about. Peoples models may not be perfect but it doesn't mean they are wrong.