Here's an example of the site overwriting a past price prediction when it didn't turn out to be accurate.
For what reason, I have no idea. Ego, maybe?
In the above screenshot, the price for regular gas on 11/14 shows 201.9.
Now, it shows 193.9 for the same date.
This isn't a site that's reliable, and as Mike mentioned the media shouldn't be sourcing it.