Here in Brazil I have found a lot of native avocado trees across the country including untended lots so I think that some avocado eating animals escaped extinction somehow and someone is full of bullshit.
Also, once the supermarket was selling Brazilian avocados and American avocados side by side and the American ones were half the size with a thicker lumpy skin. You people are getting a bad deal, our ripe avocados are very buttery and the pit comes off by hand.
Curiosity: we eat it mashed with sugar and it’s a popular homemade milkshake for kids. Guacamole isn’t a thing that exists outside of Mexican restaurants.