That is an extremely good question. It's certainly part of it. I don't know if we ever divided the subjects up by university degree, but one could do that. IIRC this paper looks at Estonia and finds that even within different levels of educational attainment (e.g. university degree) people with higher EA polygenic scores are more likely to move to the capital:

https://www.biorxiv.org/content/biorxiv/early/2025/05/18/202...