I mean, if you don't like the slope of the line on county level (included in the article), the state level lines (click on the graph to get to the tableau) have a stronger slope. But overall, you're accusing the author of bias in cherry picking the data or you're doubting statistics because the data is significant but not eye poppingly so. Really, the weakest link is the title - searching for race war isn't an act of white nationalism all the time, and may be searched by both pro and anti factions to understand why it is trending.
Overall, I thought it was really cool to not just publish the data, but also present the graphics in a way you can confirm yourself.