According to the article that's not legal. It would be surprising if it were, selling indigenous reserves and protected areas. The problem is that the people who buy then take possession of the space as if the purchase were legal and the government seems to turn a blind eye on it.
I wonder how do they target the audience? Perhaps people who search for "destroying Earth" o "I hate trees" o "kill legally"?
But no, that's not what they type, according to the article " "forest", "native jungle" and "timber"" are the search terms.