The poll was on whether Canadians think Canada should be officially bilingual. Outside Quebec, the majority of people polled don’t— which is part of the reason why official bilingualism is important.
Is official bilingualism a myth? They’d have to poll for whether those in jobs that have a bilingual requirement are actually bilingual to answer that question.
Personally, I also question the validity of the poll, as the population sample could be really easily skewed depending on how the poll was performed.