Both GM and Ford alone will very easily each sell over 4 million pickups using the same details by 2025 each just here in "tiny" North America with having only 1/14th of the population of the rest of the world that does not live in North America. Annual pickup sales have averaged over 500,000 a year for both GM and Ford and there's approx 8 years of sales left till the 2025 year.
US is not adding Pickups at 39% per year.. No it will not be selling 4 million in 2025. no way.
It is not a cumulative total but annual sales. They have stalled this year.