I stand by my statement. You might want to read those articles a little closer and add Lee Smolin's Three Roads to Quantum Gravity and perhaps Richard Feynman's The Feynman Lectures on Gravitation

The graviton is and remains a purely theoretical particle. There is no viable theory of quantum gravity, but if and when one is formulated the name for the messenger particle, the graviton, is ready and waiting. We do not yet have a description of the physics whereby that particle acts, although there is ongoing research to produce such a description. Thus far those efforts have not succeeded.

Not only are quantum field theories of gravity not EASILY renormalizable, thus far attempts have not been renormalizable at all, at that is the heart of the problem.

It is quite impossible to show that the curved space-time of general relativity is equivalent to a quantum theory. That is precisely the problem in developing a theory of quantum gravity. If you could do that you would have a quantum theory of gravity. General relativity is a completely deterministic theory and quantum theories are stochastic. What is needed is a theory that incorporates both quantum field theories and gravitation and that is closely approximated by general relativity in the limit where quantum effects are negligible.

An alternative would be a deterministic theory that provides an alternative explanation for the sub-atomic world that closely approximates quantum field theories. Most physicists feel that it is general relativity that will have to be modified, but there are some in the other camp, Roger Penrose being one.

In any case there is no consistent mathematical theory of quantum gravity at the moment and therefore there is no viable description of the graviton or quantum gravity. That could change.