1.  The SCC itself emphasized his youth, when determining whether his Charter rights had been violated.

2. "His guilt as a killer" was not determined by American courts.  He is challenging this guilty plea (after a decade in jail) on the basis of duress.  Wherever that appeal will go, the basis of the settlement was Canada's violations, not his supposed 'guilt.'

3.  Correct that no Canadian court ordered a financial payout, but the basis for that compensation (Canada's liability for the Charter violations) was confirmed in 2010.

4.  Parties to litigation should settle - as the Supreme Court itself says:
". . . the courts consistently favour the settlement of lawsuits in general. To put it another way, there is an overriding public interest in favour of settlement. This policy promotes the interests of litigants generally by saving them the expense of trial of disputed issues, and it reduces the strain upon an already overburdened provincial court system."