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If you tune up your detector that high it’s very likely you’ll get false positives. I’ve met Americans with fairly strong “accents” that aren’t necessarily a dialect either, just a different way of speaking. It could also be a mix with parents who are non-native. American English is vast, and very heterogeneous.

If we’re talking about specific parts like a regional dialect then I would agree, those are tricky to acquire later, at least to those undetectable levels. They can be extremely specific.

Yep big difference in accents of my cousins who moved here when they were 9 and another when they were 18. Now they are in their mid forties and you can still tell who moved when based on their accent. Its impossible to change your accent after late teens.

Non native can do this pretty good just due to how much American Media is available to the world.

there are people who are better than other people at blending in their accents, even in more difficult languages than English (for accent coding), perhaps they are just very good at that.