Yes that Julian Huxley.
I think John Mackey has one of the best explanations of the aristocracies’ (especially in England) fascination with Malthusian ideas comes from the fact that they are put out by entrepreneurs using their wit and social mobility to outpace the landed aristocracy. To protect their egos they adopted the Malthusian cult dogma. The Huxley brothers are stereotypical Malthusian aristocrats. Even Aldous (only intellectuals should be allowed to do psychedelics)