Earthen Floor Idea for over Wood Subfloor?

I ran across this video and was wondering if it might work for a "thinner" earth floor vs standard thick earth floors. I know you would be losing one of the most appealing aspects of a wood floor the thermal mass, but I thought it might work especially if you were to stabilize it with concrete or something.  I want a earthen floor for the ascetic, price, and because we have red clay all over the property that stains everything anyways.
Some one smarter then me please let me know the feasibility.

Even a stiff wood floor flexes. This will make earthen materials crack like crazy and likely spall off. It might work if the material is fully saturated with oil and fully bonded to the floor boards, but it would be a serious challenge.

I would definitely try test pieces on plywood before committing to a floor.