To the best of my knowledge: you cannot. (I'm an EU-based SEO. I don't know everything, but i might be a good source.) Most of the search queries that contain human names will be marked as "Some results may have been removed under data protection law in Europe." no matter wether a removal really happened or not.

Afais this is the "best" data you get from Google for this topic: https://www.google.com/transparencyreport/removals/europepri...

When you look at the other transparency reports you'll notice that you're able to search through other types of removed results (e.g. copyright violations), but that this is not possible in the right to be forgotten area.

[Edit] But you could ask any big newspaper Website for help. They receive a notice in their Search Console when a result is taken down.