I don't think it works quite that way. The pH of your body changes all the time based on exercise, diet, and emotional stress. It can be alkaline in the morning and acidic in the afternoon. But if you stay alkaline the majority of the time, you shouldn't get sick and you shouldn't have any outbreaks.
I have certainly felt the herpes tingle and then taken steps to make my body more alkaline, avoiding an outbreak.
I don't think you can ever really completely get rid of the virus. But like you, I am curious to hear from people that claim they have.