Calling this evolution is absurd. A little study should show that the age at first childbirth has varied up and down for a long, long time depending on cultural and environmental factors. Nutrition will even play a part. It makes no more sense than saying that longer hair styles are proof of evolution. In my not so humble opinion calling this evolution is totally ridiculous.
It is absurd, BUT, there is an agenda, and promotion of evolutionary worldviews is not the end goal. The Communist worldview depends on the rejection of everything else and the total adoption of exclusive materialism, which REQUIRES evolution in order to be “true”.