You must be a teenager.
Malthusianism has been the Chicken Little cry since the 1960s. Actually, it’s been around for a lot longer, but came to a head then because of leftist propaganda and the soft, absorbent skulls inundated with pseudoscientific claptrap.
You’ll love Paul Ehrlich’s “Population Bomb” and the movie that uses it as a loose basis, “Soylent Green”. Just don’t look up Ehrlich’s track record on predictions. Hint: For a futurist, he sucks donkey testicles. OOPS SPOILER!
I am not a teenager, nor am I a Paul Ehrlich fan. In fact I have the opposite beliefs as his. But Ehrlich's economics has nothing to do with whether or not the population will crash.
The basis for the movie Soylent Green was Harry Harrison’s story “Make Room, Make Room” which was published in 1966 two years before Paul Ehrlichs 1968 Population Bomb.
Musk's complaint is the opposite of Malthusianism. He's arguing implosion, not explosion.