No, it's not really. A presumptive model says if these conditions exist, then something flows. Benefit of the doubt is a way of evaluating the evidence, and as the Federal Court of Appeal has said, we still look at it. Veterans still have the burden of proving their claims, but in determining whether or not they have met that burden, we give them the benefit of the doubt with respect to the evidence.
On May 31st, 2016. See this statement in context.