Waiting for final verification is the opposite of critical thinking. It's dealing solely with already established facts. That doesn't take any critical thinking. In fact, it doesn't require any independent thinking at all.

I'm not saying they have or haven't such backdoors.

Just that whether they do or do not, you'd better estimate yourself, based on motives, opportunity, history of related cases, technological knowledge, and so on, not wait to get official or third party verification on a silver platter.