Texas Attorney General Ken Paxton sued Pfizer last week, claiming the pharmaceutical giant “deceived the public” by “unlawfully misrepresenting” the effectiveness of its mRNA COVID-19 vaccine and sought to silence critics.

The lawsuit also blames Pfizer for not ending the pandemic after the vaccine’s release in December 2020. “Contrary to Pfizer’s public statements, however, the pandemic did not end; it got worse” in 2021, the complaint reads.

“We are pursuing justice for the people of Texas, many of whom were coerced by tyrannical vaccine mandates to take a defective product sold by lies,” Paxton said in a press release. “The facts are clear. Pfizer did not tell the truth about their COVID-19 vaccines.”

In all, Paxton’s 54-page complaint acts as a compendium of pandemic-era anti-vaccine misinformation and tropes while making a slew of unsupported claims. But, central to the Lone Star State’s shaky legal argument is one that centers on the standard math Pfizer used to assess the effectiveness of its vaccine: a calculation of relative risk reduction.

This argument is as unoriginal as it is incorrect. Anti-vaccine advocates have championed this flawed math-based theory since the height of the pandemic. Actual experts have roundly debunked many times. Still, it appears in all its absurd glory in Paxton’s lawsuit last week, which seeks $10 million in reparations.