Or much smarter than you, but wanted to show the examples with syntax highlighting but couldn't be bothered to get some editor that exports as HTML or some plugin (both of which might not even be allowed/quick to install on the CMS they use).
As for the extra compression, they could just not care as the text is still visible enough, it's not supposed to be a textbook, and it's small and loads fast.
I get emails all the time where people use word or powerpoint documents with just one single image pasted inside, instead of attaching it to the email or sending it in HTML format.
A brain surgeon might be excused, but not the guys from customer's IT department or other fellow developers in offshored teams, they should know better.