I think all of your objections were already addressed in the response you quoted.
In terms of skillsets, as I said, become a farmer, or develop a trade that is sustainable in a rural area, or develop a skill where you can work from home, or live somewhere where commuting to the city from a rural area is viable. There are a great number of options. My pops had a job that only could work in the big city, but in a place like Portland you can go just 30 minutes outside the city and buy acres of land with a big house for 1/3 the cost of a two-bedroom condo in L.A. I know that's gonna be true for plenty of big cities in the South and Midwest too (even if it ain't true in LA or the Northeast).
So that addresses the skillset issue. It ain't about starting over, there's always gonna be an option where you can do just as well as you would have done in the city, except you're building wealth and living in a healthy environment rather than a crowded, concreted, pollution-choked one. You're living in a place where you have greater self-determination over what your community will look like rather than being subjected to the whims of millions of people in a city you'll never be able to control.
In terms of assets, I explicitly said, get out back into rural areas to the point where you can buy land. In many rural spots you can buy homes and land for insane cheap. My sister bought her first place in Nebraska for $34,000 and paid it off in two years. So there is a massive means of growing your individual wealth that is far less viable in the city. Who would actually lose assets by leaving the city at this point? When you are rural, EVERY family can have assets if they manage appropriately. It's not like the city where it takes a giant pile of cash to buy anything at all and any interruption in your income stream will lead to a foreclosure.
In terms of voting, I don't see why you see that as a benefit in most cities. The concentration of black people into cities is one of the tools that has enabled politicians to gerrymander districts to give Black voters a limited number of "Black" seats and absolutely nothing else. Across the USA it is a given that rural areas have votes that count more than urban areas. And in terms of local politics, it takes a shytload of work to get enough people on board for a movement even in Inglewood, a medium-small city. But you move to a rural town and you get together just a few hundred people who believe in your mission, that can be enough to swing an election in whatever direction you want. The power of a small group of concerned community activists becomes far more important.
I don't mind people who try to revitalize Black neighborhoods in the city. That's been a big part of my life. But the longer I'm living in the city, the more I'm seeing these strategic disadvantages:
#1. Air pollution is high, noise pollution is high, light pollution is high, water quality can be suspect, food quality is up to the whims of the stores nearby
#2. Overcrowding is enormous
#3. Crime is high, gang culture is nearby
#4. Schools are low-quality and the school districts are so large that parents have limited influence
#5. There's no connection to nature, few chances for kids to explore, little opportunity for kids to play outside unsupervised like kids
#6. There are fewer opportunities to grow your own food
#7. It is far more difficult to own your own land
#8. Cost of living is higher
#9. You have far less control over the cultural influences your kids are subject to
I'm sure I can think of more but that's what I come up with off the top of my head. I want cities to be better too. I work for cities to be better. But the more I live and think and read, the more I'm feeling that the greatest good can come in the revitalization of rural communities.