Well, anything written in the 1920s or '30s about the future of humanity is bound to have some questionable or horrifying bits in it somewhere: see the first several chapters of Stapledon's Last and First Men. Shaw was probably doing better on the whole. Still, I can see how listening to the third section of this, removed from its context and produced as a radio play circa 2000, would be a disconcerting experience.

(Repeatedly edited because I was unclear on when the recording was actually made.)