Buddhist contemplative traditions predate Christianity, and arose in distinct geographic locations, so nobody's de-Buddhizing anything here. Authentic understanding of the practices doesn't need to be a sectarian monopoly.
The uniquely indifferent, secular practice of "cafeteria Mindfulness" is the only novelty. It's exactly the M.O. of science: dissect a living thing and run tests until you think you know what substance makes it tick, then you isolate it, independently synthesize that substance, patent it, mass produce it, and then you wonder why you've got such shitty results in practice, and then you cover that up along with the adverse side effects, and charge the insurance companies triple profits.