When you take a canary down into a mine and you notice that something unusual seems to be happening to the bird, the correct response is not to spend a lot of time trying to figure out if the bird is really dead, how the problem started, or how we could interpret the bird's behavior.

When the canary you took into the mine suddenly looks strange, you run.

Maybe the canary didn't actually have a problem. Maybe it died due to natural causes and the mine was perfectly safe. There might be reasonable explanations for the canary's behavior that would be obvious if you took the time to perform minimal investigation. None of that matters, because the entire purpose of taking a canary down into a mine is to have an early warning signal that might save your life.

We cannot know the current situation of someone who publishes a warrant canary. What we do know that while any change might be a simple mistake, it could also be an attempt to announce some sort of warning. Just like taking the bird down into a mine, the early warning system might not be useful if you waste time arguing about it.