There is no evidence to back up any intention.
It's definitely not a government plot - but it is government policy. Not the part about keeping immigrants together, but that about keeping housing prices high. Someone living in a nice area wants their housing price rising, which means they will oppose any measure likely to reduce the price of their home(like public housing or other social welfare stuff). These things will then be concentrated in certain areas, and the housing prices of those areas will be much, much lower than other places. Newly arrived immigrants lacking in funds will move there.
It's not government policy to create ghettos, but the sum of other government policies and the desires of the population will create ghettos, even if nobody really wants ghettos. An example of the tragedy of the commons. It is possible to avoid ghetto formation(or rather, areas with very low housing prices) and create a city where the housing price is more equal across the entire city. This means you have to convince the wealthy to accept services in their neighborhood likely to drive prices down, and that's a tough ask.
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