It’s important to note there’s not really a political divide between the cultural elite evangelicals and their poorer neighbors.
I assume he's talking about college-educated, often well-off evangelicals, often in suburban areas. Not really "cultural elites" in the sense of how it is talked about politically, but still a very different group than the downscale, more rural evangelicals. Both groups typically vote about the same percentage Republican (~80%), so it's easy to miss the divides, but they're still there.
Upper-middle class evangelicals probably became staunchly Republican before more downscale evangelicals did and are also probably more resistant to voting for conservative Democrats (especially in those sorts of elections in 2016 and before). However, they are also probably slightly more willing to stay home with a really controversial Republican (i.e. Roy Moore in 2017 in Mountain Brook). They also probably have higher rates of church attendance (within the evangelical communities) because higher income people tend to be more connected with organizations (including the church) in general.
The two groups probably also differ in what issues they prioritize. The higher-income group is probably more fiscally conservative and possibly more conservative on social issues like abortion and homosexuality (but talking about it slightly differently), while the lower income group is probably more conservative on things like political correctness and possibly immigration. The higher income group tended to prefer Cruz and Rubio in 2016, while the lower income group preferred Trump. The other difference is in things like saving oneself of marriage. Few people (unfortunately) make it to their wedding day with their virginity, but that's probably slightly more common in higher income evangelical groups. Also, these are the people who are more likely to be totally abstinent from alcohol (though many still do drink), while drinking is an almost universal part of life in more rural communities.
This is all my personal impression; I don't actually know the stats on these things (other than that polling shows no overall education gap in general elections within evangelicals).
TL/DR: Higher-income, suburban, evangelicals in places like Williamson County, Tennessee tend to be more "churchy" in their lifestyles and have more Cruz-ian politics, while lower income evangelicals are more Trump-ian and populist.
