This. Many other organizations are similar degrees of separation from individuals who could plausibly be labelled as terrorists or similar, but I doubt many of the people furious at labelling this claim as "mixed" would demand fact checkers also rate such articles as wholly true if the subject of the headline was an individual closely linked to, say, the Republican party, Fox News or the NRA. And yes, if you want to believe that BLM is a terrorist organisation then the Snopes article provides enough accurate detail about the bad stuff Rosenberg did for you not to change your mind, just as any self respecting fact checker has to acknowledge that however dubious certain insinuations might be, Oliver North et al exist.