It's just an estate on land they own
No.
It’s a collaboration with a charity supporting homeless people to provide homes, along with support services for homeless people, following the assessment of previous initiatives that indicate this may be a more successful way of supporting homeless people than hostels and other interventions.
Homeless people generally have complex needs, including mental health difficulties and/or addictions. The idea behind this project is to provide the home and the support together, not one or the other in isolation. There is some small-scale evidence that this might be more effective than anything being done before.
The extra affordable housing on the existing housing estate is a separate commitment.
It’s an interesting project and daft to disparage it just because you don’t like Prince William or the royal family or whatever your beef is. It’ll be years before we know whether it’s successful.