“Deference” means that it's a standard of review. Deference would just be how much you're relying on the commissioner's findings.
What proposed subsection 103(2) of the CPPA contemplates is that, on questions of fact and on questions of mixed fact and law, the tribunal has to go with what the commissioner said about it, unless there is some compelling reason not to. In most cases, that means that whatever the commissioner found in terms of their findings of fact is final, so the commissioner's findings are a very high bar to overturn, which would not be the case in a court proceeding.