Quoting Jason Neyers:

One view of the passage you quoted is that the judge is using compensatory in the manner "necessary to undo the violation of the plaintiff's right" (i.e. all damages that are not designed to punish but cancel the violation are compensatory). In this sense, expectation damages, Blake damages and Boardman v Phipps damages are all compensatory since the aim is not to punish but to do corrective justice between the parties. In each of the situations, the remedy differs because the content of the right can be said to differ. This usage only seems strange because the Birks scientific view (compensation = factual loss, restitution = factual gain) has such cache, especially in the UK.