If your revenue doubles every month, then in the first month where you make $2.5B, your total lifetime revenue has been $5B ($2.5B this month, $1.25B the month before, etc. is a simple geometric series). But your current revenue run rate for the next year will be $2.5B x 12 = $30B.

They're not quite growing that fast, but there's nothing inherently inconsistent between these claims... as long as the growth curve is crazy.