Hello, Can you post a screen shot here of what you are seeing?
The "data accessed about your devices" messaging will show up in the Home history logs anytime a connected third-party partner or service is requesting information from the devices to function properly. In this case the connected third-party service is Amazon Alexa, and it's requesting the data through the Google Home app connection in order to control the connected smart devices in the home structure (cameras, in this case).
I think what is happening is because Amazon has access to your Google Home devices it is just hand-shaking with all the devices that it sees and not just the ones you have given access to. But it isn't actually talking to the those devices. It is more of an acknowledgment that they are there in case you do give access to them. I'm and end user (like you) this is just my best guess. But I will see if I can find out anything more.
