Note that the data isn’t even leaving Signal app in this case, it’s misinformation that this setting allows the phone to scan data, it does not. Signal would have to program in access to the data for the phone to read it, and they have not.

It does not read your data from MyChart and secure apps, even when “Learn from this App” is on. It’s misinformation that this setting enables scanning your data. The only content data it has access to is from apps that specifically programmed in access to it.

It’s misinformation that “Learn from this App” enables the content to be scanned. It does not do that.