In the blog post, if you click the link to the full commentary paper, you'll see an explanation of the creation / redemption mechanism on page 7. (vanguardblog.com)
For starters, unlike equity ETFs, some use a cash - based redemption mechanism, which generates more internal turnover and can lead the funds to generate capital gains. (etf.com)
The creation and redemption mechanisms help ETF shares trade at a price close to the market value of their underlying assets. (vanguardblog.com)