Earlier quoted context omitted.
edit: wrote comment about Herring v. United States but this is a Canadian case.
This is about a Canadian case. There is no such thing as a precedent from an American court.
As the US has the 4th amendment, most US search-and-seizure cases rest on it. If anyone were ever so bold as to argue a positive right to privacy for all humans--rather than the weaker but easier to prove prohibition against US governments committing privacy-violating acts--and the case was decided on it, that case could be used as precedent everywhere.
Judges are generally careful about not doing that, for obvious reasons. If a lawyer tried to make the case about a right to privacy, the judge might decide the outcome of the case base on that, but the opinion would certainly say that the litigant won or lost because of some other reason.
Statutory law is generally robust enough that judges can almost always decide based on it rather than on discovered law. So it's not that Canadian courts couldn't accept American precedent, it's just that American courts make special efforts to not set any Common Law precedent that a Canadian court can use. If it ever happens, it's likely to be in civil equity cases between two or more non-government parties.