Where anyone puts the “center” of the political spectrum is arbitrary and ultimately irrelevant. What we should still be able to expect is that it gets the ordering of sources correct—i.e., it doesn’t label Source A as being to the left of Source B if it’s actually to the right. And that relative ordering is still useful, as long as we bear in mind that the actual labels are otherwise arbitrary.
Where anyone puts the “center” of the political spectrum is arbitrary and ultimately irrelevant. What we should still be able to expect is that it gets the ordering of sources correct—i.e., it doesn’t label Source A as being to the left of Source B if it’s actually to the right. And that relative ordering is still useful, as long as we bear in mind that the actual labels are otherwise arbitrary.
It puts Reuters as the center and that seems pretty accurate, IMO.