The Canadian court subscribes to the living tree doctrine, so it doesn't really matter what his thoughts were at the time of signing.
The website's way of phrasing that is misleading, even if partially true.
And to further illustrate your point... The greatest authority on post-1982 Constitutionalism in Canada wasn't a politician, but a legal scholar, Peter Hogg. Sadly, he died in 2020.
Since 1986, the Oakes test has become the way to determine Section 1's applicability.
The former legislators thoughts and experiences of 1981/1982 are simply irrelevant in our legal system [1].
[0] https://en.wikipedia.org/wiki/Canadian_Charter_of_Rights_and...
I wonder how this will be framed.