If that’s the summary, then the video is overly simplistic and doesn’t understand the actual concept of media bias. The news was biased then too, especially foreign coverage, and it was biased before then. I mean, this goes all the way back to the USS Maine at the very least.
Anyone who wants to talk about media bias and hasn’t read Manufacturing Consent or other similar work needs to be banned from the topic. Learn about the propaganda model. Maybe also read about the Committee on Public Information and Edward Bernays while you’re at it.
I can’t take anyone seriously who really thinks the overall news landscape was less biased when there were only a handful of networks determining news on TV and less alternatives in the print media as well.