Degrees of Belief as Basis for Scientific Reasoning?

Bayesianism is the claim that scientific reasoning is
probabilistic, and that probabilities are adequately interpreted
as an agent"s actual subjective degrees of belief
measured by her betting behaviour.
Confirmation is one important aspect of scientific reasoning.
The thesis of this paper is the following: Given that
scientific reasoning (and thus confirmation) is at all
probabilistic, the subjective interpretation of probability has
to be given up in order to get right confirmation, and thus
scientific reasoning in general.