Thank you. That looks like it. Here’s what it looks like:

https://imgur.com/a/vRvUWxv

Isn’t the content of that email what the other people see though? If you disable your sharing, then yours won’t be shared but others might be unless they decide to disable it. I opted out of those emails.

I think you can disable it here:

Settings > Account > Sync my watch state and ratings

It’s kind of disguised as some feature to allow you to sync movie status among all plex servers. But disabling this would probably disable their ability to see it.