Thanks for bringing this up. For now there's no option to turn of those notifications on the Google Home/Nest devices. We're always looking for ways to improve, and add more useful features on our Google Home/Nest devices. We'll take this as feedback and pass it along to the team. I also suggest that you send feedback using your devices by saying, "Hey Google, send feedback" or by following the steps on this link.
Let us know if you have additional questions.
I wanted to check in and see if you managed to see Muddi's post? Are you still in need of any help with your device and the notifications? Please let me know if the issue is still present, so we can further assist.