So 15th of October Google showcased the new Recorder app for Pixel 4 devices, with real time transcription. After downloading the app and peaking inside it contains the same type of RNNT models with 2 encoders, a decoder and a joint, so I assume it's the same model. It is considerably smaller though, so I expect it to be an update.
The tflite files are also not obfuscated, and the zip contains .ascii_proto files that are human readable. It even contains shell scripts to run the models on a local machine!
This is the third full model I'm analysing, and seems to contain the most info thus far. I'll update this log is I find out more.