It states that whenever the press writes about something we know well, we scoff at how wrong they get it. Then we turn the page to a new story about something in which we lack expertise and believe every word of it.
[1] https://www.cjchilvers.com/blog/the-gell-mann-amnesia-effect
Actually, journalists interview these people.
That's why every single 'controversy' and news story ends up on every media site under the sun.
Plenty of journalists have experience in the fields they cover (check out the SCOTUSblog's publisher's bio, for example: http://www.scotusblog.com/author/tom-goldstein/) and the longer they cover a particular beat the more info they get about the field they're covering.