Okay so, I just learned that there actually is a way to report outdated satellite imagery directly to Google. They don’t promise to do anything about it, but it might get the ball rolling. You do it by filling out this form:
https://support.google.com/maps/contact/report_outdated_imagery
Google has no general direct customer support contact, but they do make special contact forms available for certain specific types of requests - I didn’t expect this to be one of them, but there you go!