I can actually think of some including what was presented in the article.
Putting on my science hat, I believe this is the first time a brain scan was done of someone experiencing xenoglossy and the results were unexpected. From a research perspective, this calls for others experiencing xenoglossy to have brain scans to determine if there's a consistent area of the brain activated. And for comparison scans done of people who have learned a second language etc.
The part of the brain activated is also, as the article stated and is confirmed by research identified with feelings of selflessness
https://www.tandfonline.com/doi/abs/10.1080/10508619.2012.657524 and that to me is an important clue.