So you're saying Chernobyl wasn't caused by hurried and ill-prepared testing of a safety feature they failed to verify during initial startup and instead had to do years later during regular operation?

I guess the grid controller requesting a pause of the power reduction to compensate for another plant going offline didn't happen either, and the test wasn't pushed back from the day shift to the completely unprepared night shift - and I guess they didn't manage to botch the entire procedure by placing the reactor in an extremely unstable state from which recovery was impossible due to a known design quirk kept secret from its operators?