I've seen the same posts you have linked and can only conclude that they've currently been using either React Native for Web or are using a React website in an Electron app, and are planning on releasing a RNW app. The current app could perhaps be using RNW but targeting win32.
But note that someone from Microsoft linked that tweet in response to a question of who uses RNW: https://github.com/microsoft/microsoft-ui-xaml/issues/6050#i...