The paper cited states, "From these results19, we found that a significant amount of TMM, 0.017–0.026 Earth masses (M⊕) (Extended Data Table1), could have entered the lower mantle layer, which is comparable with mass estimates of approximately 0.01–0.06M⊕ for the LLVPs14,20. However, both thermo-dynamics and material mixing are sensitive to the setup of numerical models, including equations of state, numerical resolution and the hydrodynamical method (Methods).",
https://www.nature.com/articles/s41...Y2XiYMBdNNNUK&tracking_referrer=www.space.com
I am not sure what the proto-earth mass was used in the simulations reported here and density compared to Theia modeling before the giant impact. I have read some reports where the proto-earth mass before Theia impact ranged some 0.6 to 0.9 present day earth mass. The Moon that formed after the giant impact likely was a smaller mass Moon too, not much reported on questions like this it seems to me.
When it comes to the exoplanet lists, there are no confirmed exomoons that formed via a giant impact it seems.
This encyclopaedia provides latest detections and data announced by professional astronomers about exoplanetary systems. It is about objets lighter than 60 Jupiter masses, which are orbiting stars/brown dwarf or are free floating. It provides also a database about planets in binary systems, and...
exoplanet.eu
exoplanetarchive.ipac.caltech.edu
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