Siri doesn’t need to talk to Apple servers for Home control but Apple was already caught having its employees, or a third party contractor, listen in on Siri conversations. I do believe Apple has the best security policies in place but I don’t believe for a minute they are as strict as they would have us believe.
I suppose someone needs to correct Siri’s mistakes but that should be a function of the end user. We should be the ones correcting Siri, not an Apple employee or contractor. I have Analytics and Improvements turned off so why am I getting hit with server side bugs?