Because scale. One is very limited in scope, ie: On one day, in one city, on one road, for a few minutes, one car caused a few other vehicles to make otherwise unnecessary lane-changes. vs the vulnerabilities exposed which affect tens or hundreds of thousands of vehicles in every city, every day, on almost every road, at almost any time.

Agreed, the researchers deserve some criticism, but let's not lose sight of the forest for these two goofball trees.