[ETH_start]

The assumption of judicial law is that there is an objective correct answer and that later rulings are more likely to arrive at it than their precedents.

The passage you quote does not contradict this. Note it states that court interpretation is

"based on the traditional tools of statutory construction, not individual policy preferences"

The ambiguity means that the correctness is a matter of probability, which implies that the probability of making a correct ruling increases with the amount of precedent a ruling has to fall back on.