Help me understand the Canadian economy's disproportionate weight in XEQT

Given the fact that Canada’s GDP (approximately $2 trillion USD) is roughly 2% of global GDP (approximately $100 trillion), isn’t Canada’s economy overly weighted within XEQT (approximately 25%)?

I understand that XEQT may not strive to invest in direct proportion to each national economy, but what is the justification or rationale behind this particular allocation of investments (approximately 50% U.S., 25% developed Europe, Asia, and Australia, 25% Canada)?

Consider the following passage from the book Nudge by Richard Thaler and Cass R. Sunstein (the former a winner of the Nobel prize in economics):

“Active Choosers [of pension plans in Sweden] elected to invest nearly half their money (48.2%) in the stocks of Swedish companies. This reflects the well-known tendency of investors to buy stocks from their home country, something that economists refer to as the home bias. Of course, you might think that investing at home makes sense: ‘Buy what you know!’ But when it comes to investing, buying what you think you know does not necessarily make sense… Consider the following fact: Sweden accounts for about 1 percent of the world economy. An investor in Germany or Japan looking for a globally diversified portfolio would invest about 1 percent of his assets in Swedish stocks. Can it make sense for Swedish investors to invest 48 times more? No.” (Richard Thaler and Cass R. Sunstein, Nudge: The Final Edition, 2021, page 205)

P.S. In the passage above the authors cite the paper “Investor Diversification and International Equity Markets” by Kenneth R. French and James M. Poterba, The American Economic Review, 1991