I wonder if these "facts" are correct or he makes assumption based on false facts. He's trying to say that Colorado hasn't analysed public costs (healthcare, addiction recovery, preventative work) after legalization? It is hard to believe that no such data are available. And he presumes that costs will be higher than income on taxes.
In fiscal year 2016, marijuana tax revenue resulted in $156,701,018. The total tax revenue for Colorado was $13,327,123,798, making marijuana only 1.18% of the state's total tax revenue. The cost of marijuana legalization in public awareness campaigns, law enforcement, healthcare treatment, addiction recovery, and preventative work is an unknown cost to date.