It's worth not concentrating too much on the first paragraph of the article, which merely talks about a common cultural cliché and reading the rest, which answers your question.

Also note that multiple species can be "apex predators" in an ecosystem.

The rest of the article suggest White Shakes will leave the area once Killer Whales appears.

Isn't that the normal scenario of an apex predators appearance? Which is why I am asking, or is this a false assumption?