https://phys.org/news/2026-10-suebi-alans-visigoths-erase-deep.html
Interesting but I don't find the conclusion surprising. The Suevi, Vandals and Alans placed themselves as elites within Spain so I am not sure why you would expect them to add much to the genetic diversity of Spain. The Roman Empire had opened up Spain to wider trading and movement across the Empire for over 400 years.