There isn't any actual proof that Pope Francis denied the Divinity of Christ. That doesn't mean that he didn't say it, but since there's no proof, except for a second-hand testimony, then no formal case can be made against him.
Even if Francis were to state outright that Christ is not Divine, there would still be difficulty in dealing with him, or removing him. The Church does not have a set doctrine or formula on how to deal with a Pope who has fallen into heresy. We can quote our favorite theologians on the subject all we want, but there was, and is, no consensus or unanimity on the subject by all of the various theologians, regarding a Pope who falls into heresy.