Then, the question is about AC's safety culture. Does it inhibit honest reporting of mistakes. Did the crew feel likely to be disciplined? Were they cognizant of the error and, if so, thought it could be hidden.
Apparently, right after the landing the Captain on his own initiative asked for the ATC's telephone number and called them to discuss the incident. That's not typical behavior of a crew attempting to hide anything.
And, for all we know, the crew might have reported the incident through normal Air Canada channels.
I reviewed NTSB 830 again and surprisingly there is no requirement to immediately report this type of incident to the NTSB.