The source for that claim is entirely from the US state department. Not to mention some expert disputed that claim

"The estimated all-time high for opium production was set in 2017 at 9,900 tons worth some $1.4 billion in sales by farmers or roughly 7% of Afghanistan's GDP, the UNODC reported."

"Mansfield says his field studies show the most the Taliban can earn from illicit opiates is about $40 million annually"

So the Taliban made at most 40 million per year while the entire country (under US occupation and control) made over 1 billion per year