Indeed, according to the abstract (http://www.nature.com/ngeo/journal/v5/n4/full/ngeo1429.html http://www.nature.com/ngeo/journal/v5/n4/full/ngeo1429.html) the

Indeed, according to the abstract (http://www.nature.com/ngeo/journal/v5/n4/full/ngeo1429.html http://www.nature.com/ngeo/journal/v5/n4/full/ngeo1429.html) the paper only presents (additional) evidence against the hypothesis that 40% of the moon material comes from Theia. But it doesn't reject the hypothesis that the moon was formed by an impact: The isotopic homogeneity of this highly refractory element suggests that lunar material was derived from the proto-Earth mantle, an origin that could be explained by efficient impact ejection, by an exchange of material between the Earth’s magma ocean and the protolunar disk, or by fission from a rapidly rotating post-impact Earth.