The jobs in the cities weren't created by the new farming techniques though, those new farming techniques only removed jobs by the millions like you are saying AI might do.
I didn't say they were created by new farming techniques, I said new jobs in general were created by increased urbanization, which was partially fed by agricultural innovations over time. For example, Jethro Tull's seed drill (1701) enabled sowing seeds in neat rows, which eliminated the jobs of "broadcast seeders" (actual title). If you lost your farming job due to automation, you could move to the city to feed your family.
There is no similar net creation of jobs for society if jobs are eliminated by AI, and it's even worse than that because many of the jobs are specialized, high-skill positions that can't be transferred to other careers easily. It goes without saying that it also includes millions of low-skill jobs like cashiers, stockers, data entry, CS reps, etc. Generally people who are already struggling to get enough hours and feed their families as it is.
If AI replaces millions of jobs, it will be a net negative in job availability for working class people.
I agree with your last point, the way the system is set up is incompatible with the looming future.