Unfortunately, with Trump politicizing this so much, the waters are very muddy now on any research on this coming from the US. I'll wait for the EU/Japan researchers' review.
If your question is in good faith, US researchers work on US universities and research institutes, both partly sponsored by the US government, who is very vocal on what it thinks the scientific opinion should be. And this new study is a meta study only (at best), very subject to interpretation by what I skimmed.
OK, but the response still answered your question: Trump and his cronies get to pick and choose which research gets funded and publicized through government channels.
