How did he play with numbers, or do you just not like the facts he lays out?
For one he just makes an assertion. He provides no details and no documentation. As far as we know he is counting as a cost of immigration the cost of providing K-12 schooling to all children in the state (Many costs are sunk costs - You expand the class size rather than build new schools) or the cost of staffing an ER regardless of who is being served. Hell, he could even be counting the cost of unemployment benefits for the American worker who cant find a job and blames his failure to find a $150,000 a year computer programming gig on the immigrant crossing over from Mexico.