It would be journalistic malpractice to avoid reporting on anything that the government does that the government isn't willing to admit publically to doing. It's possible to ascertain facts, even of the actions of the US government, to a level of certainty sufficient to report them as facts, even when the government disputes the facts.
Repeating the IRGC claim that "American forces killed between 175 and 180 people, most of them girls between the ages of seven and 12" without attribution or scrutiny, is not "reporting".
It's fine to be skeptical of the claims of the US government. But the IRGC is also a government - more specifically a totalitarian government built on lies and aggression. To distrust the former while blindly trusting the latter is inconsistent and foolish.