I don't think so. You would have to look at the committee against torture report, in “General Comment No. 2”, where acts of torture in the private realm are acknowledged as crimes. The committee has never suggested that if there are two laws, that would somehow compromise the obligations of a state.
Evidence of meeting #24 for Justice and Human Rights in the 42nd Parliament, 1st session. (The original version is on Parliament’s site, as are the minutes.) The winning word was non-state.
A video is available from Parliament.