Hot word is not available, sample is depraced.

[kamilk91]

https://developers.google.com/assistant/sdk/guides/library/python/extend/handle-device-commands
here is depraced sample. Hot word option is not available.

[beckmx]

Adding for those who are trying to enable hotword feature and avoid push enter to talk you can do these steps:
// upgrade google-assistant-library
$ python3 -m pip install --upgrade google-assistant-library

//Run the demo
google-assistant-demo --project-id PROJECT_ID --device-model-id DEVICE_MODEL

and then you can use "hey google or OK google" hotword, no keyentries needed.
You can also make it run at system startup which makes it great ;)

[lordjoo]

It says it's deprecated