@cwebber NOOOO! That is so shitty! I would hunt the author of that howto down.
If there really was a useful and specific reason to demonstrate that error, it should be put in a box at the end of the article with a warning, so those who are time pressured do not encounter it - and many people reading shorter tutorials as opposed to a whole "textbook" type teaching course usually are under time pressure..
pull quote is the kind of thing I was thinking of, but I had forgot what it was called, and was also recalling 1980s/1990s era computer and electronics books I've read where there was a marker like an asterisk or arrow and/or a paragraph or box (sometimes at the end of the article) containing warnings of this nature (perhaps this is in the days before TL;DR culture...)
One of the first Mastodon instances, there is no specific topic we're into, just enjoy your time!