In other words, Trump Sr. was following government guidelines and the prevailing practices of the day. Both were bad, but nothing unique to Trump. "Enthusiastic embrace" and "New Deal vision" may reflect the writer's own prejudices. I don't think he's looked at how developers and landlords behaved -- or at the racial ideas and practices of FDR-era politicians.
Big section in book THE TRUMPS by Gwenda Blair covers his father’s testimony before congress exposing the NYC housing corruption. He was praised by the Indiana Senator head of the committee and told to keep up the good work
BYW if you have a garage attached to your house thank Fred Trump. It was his idea to put a little room next to the house to make it easier for the families during bad weather. It is one reason that FT was so successful His houses were in great demand