Is their worldview transhumanist, though? Transhumanism isnβt inherently antihuman (except possibly on the individual scale).
Possibly I just havenβt seen enough, but in my experience, I havenβt seen transhuman-leaning people argue for reducing population or any of these measures, and they come across kind of anti-elitist.
The people youβve named, on the other hand, donβt seem interested in uploading or augmenting themselves so much as they are interested in controlling others.