Not to my mind, science requires a testable hypothesis and evidence. I would argue that merely refuting someone else's hypothesis without providing a new one doesn't meet the bar of doing science.
Science requires systematic observation, measurement and usually variation (often experimentally controlled); and, usually, iterations.
One datapoint outside such a system is not science.
You can't even necessarily just insert a new datapoint into a pre-existing scientific sytem. The system itself may need to be adjusted, for example to test and account for biases that often occur due to how observations are made.