Explanation
No. The study does not prove that Venus once had a moon and swallowed it. It investigates whether a hypothetical moon could survive, rather than establishing that such a moon existed.
The researchers modelled interactions between Venus, a satellite and the Sun under different starting conditions. Some scenarios led to the moon's destruction, while others allowed survival. The results provide a possible explanation for Venus's lack of a moon, conditional on the model assumptions.
UC Riverside's September 14 announcement explicitly says that whether a moon ever formed remains an open question. A model showing how an event could happen is not evidence that it actually happened. The proposed history remains a hypothesis.
Key takeaway
The study offers a possible fate for a hypothetical Venusian moon. It does not confirm that Venus ever had or destroyed one.