Just because someone on Facebook claims to be Native, doesn't mean they are. And even if some dude with a ginormous beard and blond hair, saying things that sound very non-Native does turn out to have a bit of distant heritage, it doesn't mean they are part of a traditional Native community, or know anything about the real traditions of the community they are trying to claim. People who believe they are Native "in their heart" often say things like that.
The more people complain about wanting "teachers" and wanting "teachings," the more out of touch they sound.
And for a non-Native, or someone with only distant heritage, to say other cultures have no heritage... that is just ignorant and disrespectful of the many, diverse cultures on this Earth who have Earth-honouring, spiritual traditions. It's the plea of the wannabe, the pretendian, the outsider trying to justify misappropriation.
People often try to re-invent themselves on social media, or pose as something they are not. Facebook is rife with pretendians and groups of appropriators, and it looks like that is one of them.