Could you define the set of beliefs that comprise "right-leaning"? That should help here.
Unfortunately, right leaning in the US has come to include views that run counter to science, diversity/inclusivity, and human rights for all (right to vote, right to choose). Are these views welcome in tech companies? Not generally.
That kind of phrasing is pretty obnoxious. You might as well as "unfortunately, [to be] right leaning in the US means hating puppies and disliking fun." It's needlessly provoking and lumps people into a lazy stereotype.