That answer is incorrect. Common law can only be created by courts.
https://www.law.nyu.edu/sites/default/files/ECM_PRO_060886.p...
Uh huh. And, as tptacek said, dang and tomhow are the courts here. So what they have consistently ruled is the common law here.
https://www.law.nyu.edu/sites/default/files/ECM_PRO_060886.p...