Docs, could a hiv positive person get acute retroviral syndrome upon reinfection?

Yes, theoretically: Yes, it is theoretically possible that someone could get acute retroviral syndrome upon reinfection with another strain of HIV. First of all, reinfection is very, very rare but not impossible. However, reinfection with a second strain (perhaps more powerful than the original strain) theoretically could cause an acute retroviral syndrome as it is a completely new infection altogether.