Is their worldview transhumanist, though? Transhumanism isn’t inherently antihuman (except possibly on the individual scale).

Possibly I just haven’t seen enough, but in my experience, I haven’t seen transhuman-leaning people argue for reducing population or any of these measures, and they come across kind of anti-elitist.

The people you’ve named, on the other hand, don’t seem interested in uploading or augmenting themselves so much as they are interested in controlling others.