The point here is actually about banks, or is in reference to banks. They expect you know how a savings account at a bank works, but not mutual funds, and so are trying to dispel an erroneous notion that you might have -- that the CBIC will insure your investment in the fund.
Banks work by taking in deposits and lending that money out via mortgages. The mortgages can last up to 30 years, but the deposits are "on demand". Which means you can pull your money out at any time.
See the problem? They're maintaining a fiction that that money is there, safe and sound in the bank vault, ready to be returned whenever you want it, when in fact it's been loaned out. And can't be called back quickly, either. They know only a little bit of that money will be "demanded" by depositors at any given time, so they keep a percentage called a "reserve" to satisfy that, er, demand. The rest, again, is loaned out. Gone.
And usually that works out just fine. Except sometimes it doesn't, when people get scared they might not get their money back, and they all go to the bank at the same time to demand their on-demand deposits back. This is called a "run on the bank", and when that happens, the bank "fails". 'Cause it ain't got the money.
What's failing, in fact, is the fiction that your money is there whenever you want it. And that's really bad, because when that happens to you at your bank, your friends the customers of other banks start worrying about their money, and run on their banks, which fail, which cause more people to worry and try to get their cash out, lather, rinse repeat, until the whole economy crashes. See -- The Great Depression.
So, various governments introduced "Deposit Insurance", where the government will step in with the cash, so when you panic and pull all your money out of the bank, you can go home happy, cash in hand, and don't freak all your friends out. Therefore, the fear that your money might not really be there is assuaged, and it doesn't spread like a mental contagion. Everyone can comfortably go back to believing the fiction, and the economy goes back to merrily chugging along.
Meanwhile, with mutual funds & ETFs, everyone understands the money you put in them is invested and not sitting in a gigantic vault, and so there's no need for government insurance to maintain the fiction.
And that's the point they're trying to make. Poorly, I might add, where their wording is concerned.