I googled Texas undocumented workers and health care and came up with a study by the Texas comptroller published last December. Carole Keeton Strayhorn issued the study which said undocumented workers added $1.58 billion in state revenue and used $1.16 billion in state services. In the same paragraph, in fact immediately following those figures, the article also states "However, local governments bore the burden of about $1.44 billion in uncompensated health care costs and local law enforcement costs not paid for by the state." So the good professor cherrypicked the study and disregarded the costs that the state does not directly pay through general funds.