I don't see your criticism at all, and I don't think there's anything aggressive or vitriolic here.

The article is specifically a rebuttal to a Wirecutter review, so the target audience is really anyone who cares what Wirecutter thinks about purifiers (a lot of people rely on it to guide their buying decisions, after all), and perhaps the staff at Wirecutter.

I can't speak to the article's technical accuracy, but it appears to do a good job of systematically breaking down their analysis using technical arguments, visualizations, and math.