"Follow rigid time schedules" is all about industrialization and the spread of railways. That's all there is to it. That's why people have been caring about that since 200 years ago in the U.S. and not at all in places like Nigeria.
That may well be, but it does not change the cultural link of it today among people who have grown up in industrialised cities with extensive railways and still apply 'African time'.
That cultural aspects can change quickly does not mean they don't exist.
Most of the things listed are very much cultural, and the bourgeois assumptions within different cultures would vary massively.
E.g. "Follow rigid time schedules" is a good example that is very much cultural. My ex is Nigerian. She'll adjust her adherence to schedules based on whether or not she's going to meet white or black friends. With white friends e.g. a 2pm start for an event means the event will start at 2pm. With her black friends a 2pm start means 2pm is the earliest it's ok to consider arriving, and most likely people will start arriving by 3pm-4pm. "African time" is very much a real cultural expectation that has nothing to do with being bourgeois or working class. It's not better or worse; just a different way of thinking about time.
You might suggest she's just not "bourgeois", except she comes from a family full of leading lawyers. When I first started dating her, her dad disapproved enough to have the wife of Nigerias then vice president call her to try to talk her out of it. She grew up with servants, before she was shipped off to an expensive English boarding school. In other words: "African time" has nothing to do with socioeconomic status, and everything to do with culture.
In the US these are "bourgeois values" because bourgeois values in the US are values mostly influenced by European protestant values, and so dominated by "white" cultures.
It doesn't mean none of these values are shared by subsets of black people. Or Asian people, or whatever other group. E.g. the section on justice is very much shared by Nigerians for example, as the Nigerian system very much adopted British legal customs.
It does means most of these values are culturally dependent, and not universal, and that the origin of the US take on this is "white". It doesn't map neatly to race, but it works as a short-hand to point out that a whole lot of things we take as given about how society "should" operate and what is polite, or bourgeois, is based on cultural expectation that very often follows ethnic lines for historical reasons.