This link says absolutely nothing about Flutter usage.
It's about apps that are already written in native iOS code, which are currently using custom Material Design components (which are mostly/entirely in obj-c), and that going forward those custom Material components are going to be phased out and apps will use standard UIKit elements instead.
This tells you absolutely nothing about Google's commitment to flutter.
So it says nothing about using Flutter even though the entire purpose of Flutter is to write cross platform apps and Google is moving toward not writing cross platform apps and are using standard UIKit components.
They also aren’t using Dart and are using Objective C.
But that doesn’t mean they are moving away from Flutter for first party apps?
They aren't moving away because these Google apps weren't using Flutter in the first place. The only ones that were are like, Google Pay and Google Classroom.
https://9to5google.com/2021/10/10/google-ios-apps-native/