To provide a thorough answer, it would be helpful to know specifically which individual or statements you are referring to regarding the Seminole. The Seminole people are a Native American tribe originally from Florida, and their history includes numerous treaties, conflicts, and interactions with various political figures and governments.
If you have a specific incident, person, or context in mind, please provide more details so I can offer a more precise analysis of how their statements might not have been truthful. In general, discussions about treaties and agreements often reveal discrepancies between what was promised and what was delivered, which can lead to misunderstandings and mistrust between parties.