> while the graphic used seems to imply a trend, it seems like more data would be needed to conclusively show that trend.

And you can tell that by looking at the graphic...? There's also a reference to a X2-test with p=0.0005 (meaning that there's a 0.05% chance that the trend you see is accidental and would disappear with more data).

I think you're right to be skeptical (correlation is not causation and so on...), but not that too little data is the problem here.