Willem, you're assuming quite a lot, and it almost sounds like you're taking everything in that article at face value. Several parts of it are ahem problematic.
For one thing, the person in the video preaching about this is, herself, a colonist. Born in the Persian Gulf, she moved to the United States later in life. In other words, she deliberately colonized Native American land, unlike the people who were born here, who merely accidentally colonized it. I tend not to listen to hypocrites who deliberately do exactly what they're telling other people not to do, especially when the people using them as sources ask for money at the end of their articles.
Second, this quote. "You are not here to engage in any type of cultural, spiritual or religious needs you think you might have..."
Clearly, the point of being an ally is not to fulfill the spiritual needs of the ally. The point is to get stuff done. The article is correct on that first point. The part I take issue with is in bold. The wording of sentence heavily implies that non-indigenous or white people simply do not have cultural or spiritual needs. That's very typical for the sort of people who write those articles. They label anything white as "mayo" and refuse to believe it could ever be linked to a culture of its own. If we're ever going to stop conquering and destroying people, as a species, then we need to acknowledge the autonomous original cultures of every race and group, not just the cultures of the people who have the most melanin.
In my distant family history, my ancestors were conquered by the Romans and assimilated. Was it not for the Roman Empire, I might actually have an intact indigenous culture, but that was taken. That does not mean I go around telling brown people that they have to leave Europe, and it certainly does not mean that I tell the residents of the Mediterranean to "check their privilege" when they debate with me.
If the authors of these articles took ownership of their heritage and lifestyles, I'd be more inclined to agree with them. For example, if the people writing these articles online were indigenous native americans, raised within their ancestral culture in as close to an ancient lifestyle as is practical, their words would have meaning, because they would be speaking from the same perspective that they claim to represent. However, they often end up being a group of privileged upper-class people complaining about other people's supposed privilege, in a circle-jerk of unprecedented hilarity. It's impossible to know exactly how many of the articles like this are legitimate, but it's a certainty that some of them are the sort of nonsense I've described, and it's the nonsense bits I'm picking on right now.
Why am I simply focusing on the nonsense bits and ignoring the good parts?
Simple answer: Because I go into a dark mood when someone implies that I can't possibly have cultural or spiritual needs. Especially when the person making that accusation is doing absolutely nothing to reclaim their own heritage, but instead is making a killing on book deals and TV appearances, which (not coincidentally) is part of the lifestyle killing even more indigenous cultures around the world.