One, that’s not a great journal to publish your findings. That means that the study might be significantly flawed or of low quality.
Second, I have two friends on different coasts on the frontline of this and both have been using this combo. One said he thought his patients did worse. The other thought it seemed to help with mild cases only and had no real effect on the more severely ill. If it was as good as these French researchers say, these guys should have seen better results.