You don't need to trust Google, but it certainly don't mean making general statements about what Google is doing. The article says nothing about discouraging Flutter use and given Flutter 3 came out this year, Google is still supporting and using it. Flutter has iOS UI replication of look and feel, which is what that article says Google is encouraging. Fuschia hasn't come out yet, but it still uses Dart and Flutter is used to create apps on it.

I'll take a bet, use and choose Flutter for a long time.