IANAL, but that cases seem very different. This appears direct (prevent the federal officer from completing their enforcement action), where the Bundy brothers appears to have been indirect (in response to a federal officers that completed their action):

> In response to the imprisonment of two Harney County ranchers, who were prosecuted for arson, Ammon and Ryan led a group of activists in an occupation of the Malheur national wildlife refuge, an obscure sanctuary for birds.

> Ammon declared that he and other protesters, some who openly carried firearms and took over government buildings and equipment, would stay until the ranchers were freed and the refuge land was given to locals to control.