The messaging in the article is a bit mixed, which makes sense because it's trying to explain Google's intentionally confusing messaging, but I would like to highlight one thing:
Can you fully disable Gemini on Android? No, and that’s by design. While you can turn off activity tracking, revoke permissions, and even uninstall the Gemini app on some devices, Google is actively replacing its Assistant app with Gemini. By the end of 2025, Gemini will be the default...
If you use Android, you should not use its Assistant if you want to keep Google away from your data.
This applies whether Google calls it Gemini or not.
To be fair, the article itself recommends it.