Governments lie, but that does not mean everything ever said by any government agency, bureaucrat, or employee is a lie. Remember that the best lies aren't utter falsehoods, but rather slight deviations from the truth or fallacious distortions of reality.
There is ample verifiable evidence that the Earth is a massive sphere, and there are many ways this can be tested and demonstrated. Every flat earth argument I have seen is either a misinterpretation of data or outright bad testing methodology.