It sounds like -- though is not explicitly stated -- that this study is specific to the 2020 election. I'm not sure that this can be generalized to all misinformation.
I could easily imagine election involvement being different than, say, information about Ukraine.
Also, the criteria here was whether people linked to sites used to spread misinformation, rather than whether an individual story was true or not. So the metric here is maybe specific to ability to evaluate how sketchy an online news source is. If, for example, a friend posted some information directly, it might be that behavior would be different.