While being an avid Debian user on both server and desktop, I had never heard of the Extrepo[0] package mentioned in the article. It would be great if the repositories included in there would suggest this way of adding their repo. While it cannot guarantee the safety of added packages, it at least add an extra layer of checks.
Another useful thing from the article for me was `apt modernize-sources` to update the existing sources.list to the new structure. Now I need to check if scripts like this run automatically on my auto-updating desktop from my parents.