By that argument, we'd expect the first major clusters outside Asia to appear at airports or seaports, since the virus couldn't have been introduced anywhere else. They didn't, instead appearing in nursing homes, choir practices, and other locations where it spread particularly fast to patients who were particularly likely to seek medical attention.

There is no reason to believe it's possible to determine the point of introduction with such granularity from initial epidemiological data. The form of modeling behind these geographic claims shows no history of correct predictions, making them essentially unfalsifiable.

The misleading claims that you're repeating here are exactly those promoted by the scientific press, including both the highest-impact peer-reviewed journals and popular outlets like Scientific American. If you are willing to entertain the possibility that they'd misinform you and seek sources outside that bubble, then I believe you'll see that yourself.