there is no western blot at home test. Are you thinking of an immunoblot? Or you may have been able to order the western blot kit from the University of Washington but you still need a provider to order it for you. I’m not sure exactly what you mean here.
For the real western blot, the UW recommends that you wait 12 weeks from any concerning encounter to do the test.
The statistics you are reading are a study comparing people who are swab test positive for HSV 2 and also do this antibody test. But when the population changes to those who are simply testing for HSV 2 and have no symptoms, the statistics turn out to be very different.
Here is the paper for that reference:
Sex Transm Disease, 2017 Dec;44(12):763-767.
Performance of Commercial Enzyme-Linked Immunoassays for Diagnosis of Herpes Simplex Virus-1 and Herpes Simplex Virus-2 Infection in a Clinical Setting
Elfriede Agyemang 1 , Quynh-An Le, Terri Warren, Amalia S Magaret, Stacy Selke, Christine Johnston, Keith R Jerome, Anna Wald