Complete bullshit. Generics have 0 relationship or co-dependency of any kind with the abstraction slash design patterns you mention. These are entirely possible without generics, and generics does not in any way encourage them.
There are less common design patterns particular to generics. The presence of generics does tend to encourage those. I have seen subsystems where coders used C++ templates where they could have used polymorphism instead.
... I'm sorry, that's a bold claim when a large chunk of these patterns are literally used to allow for you to be able to operate over a variety of different objects in a loosely coupled fashion
