"X did Y" works equally as well as "X just did Y." I'm sure they use 'just' to make the article seem more immediate. "The Price of Solar Power fell 50% in 16 months" has a markedly different tone than "The price of solar power just fell 50% in 16 months". The headline with the work 'just' seems like breaking news. The other variant seems like a normal report that you can pick up an read at your leisure.
Most articles in a normal newspaper don't do this because they don't have to. Only the headline needs to be sensationalist to sell the paper. On a website, every article needs to drag people in. The current headline is click-bait. That would be forgivable if the entire article wasn't terrible as well. There is very little content or analysis, everything is cribbed from other sources, including the charts. I will give the author credit for linking all of their sources, but that is where my praise ends.
Most articles in a normal newspaper don't do this because they don't have to. Only the headline needs to be sensationalist to sell the paper. On a website, every article needs to drag people in. The current headline is click-bait. That would be forgivable if the entire article wasn't terrible as well. There is very little content or analysis, everything is cribbed from other sources, including the charts. I will give the author credit for linking all of their sources, but that is where my praise ends.