That is simply not true. We have accountability methods employed that are themselves AI-assisted, that help us gauge the alignment of various AIs.
There are so many ways we have misplaced confidence with what is essentially a system we don't really understand fully. We just keep anthropomorphizing the results and thinking "yeah, this is how humans think so we understand". We don't know for sure if that's true, or if we are being deceived, or making fundamental errors in judgement due to not having enough data.