The columnist admits that Potter quantitatively documents a relative lack of "social capital" in Quebec", including the agreed upon fact that Quebec has a larger "underground" economy than the rest of Canada. He then claims that the following anecdotes are demonstrably false:

"He chose, alas, to pepper his piece with dumb anecdotes that do not stand up to scrutiny if you’ve lived here for a while, like the statement that it is common for restaurants in Montreal to offer two sets of bills, or that doctors routinely ask to be paid in cash, or that ATM machines regularly churn out $50 bills."

All of these activities would relate to tax evasion ie the underground economy,  which he has already admitted is larger in Quebec than elsewhere in Canada. (I've done a little research  and that is an actual fact). 

But these are falsehoods because he believes that  they "do not stand up to scrutiny"?   

Well all right then.

PS: Restaurants take cash under the table everywhere. Don't be mad.