Exactly. Biden never called her that. The title was a media creation. In fact, her role was more diplomatic than executive:
https://www.cbsnews.com/news/kamala-harris-immigration-biden-administration-border/
The facts about Kamala Harris' role on immigration in the Biden administration
"Mr. Biden tasked Harris with leading the administration's diplomatic campaign to address the "root causes" of migration from Guatemala, Honduras and El Salvador, including poverty, corruption and violence."