Not getting clearly what is your father status now as per aasld guidelines for hbeag negative patient if Hbv DNA >2000 Lft 2× normal limit of sgpt and sgot
Fibroscan not normal then treatment required so what is your father status now
Ilbs Delhi is very reputed organisation for Hbv so I think your father previous report hbv DNA more than four lakhs is wrong
I would agree with you doctor. Because your father's liver is in very good condition (Fibroscan 3.3Kpa), I suspect he was infected as an adult and not at birth, so his prognosis is very good. Do follow his doctor's advice.
Just my opinion.
What makes you believe that he was not infected at birth ?
One of my uncle does have hep B ( he regulary takes needle for sugar problem ) , Status of grand ma is not known