* The default console font in MS-DOS wasn't Courier like. It comes from the video hardware.
* Here's a screenshot of Windows 1.0 showing the various fonts it ships with, you'll note the Terminal font is different from Courier. https://youtu.be/KWEsBiIxMaU?t=558 and in another video here https://youtu.be/xiKwErpPwMs?t=154 -- you can see Windows 1.0 Notepad using non-Courier font.
Oh boy, do we have a youngster here.
Back in the days. Before true type (freely scalable) fonts. When Windows was based on DOS.
Even the default console font in MS DOS was courier-like.
It's not a far fetched claim. It definitely shows long roots.
Also: Show source in Firefox uses (used?) Courier iirc.