This is the context:
On the idea of whether the quantum multiverse is the same as the inflationary multiverse . . . I heard this proposed by Leonard Susskind, one of the inventors of string theory at Stanford. I was talking to Steven Weinberg, who is the father of the standard model of particle physics, probably the greatest physicist living, and he said, “This idea seems crazy to me that Susskind could identify the quantum multiverse with the inflationary multiverse. They are at right angles to each other.”
What is the meaning of the bold part? Does that mean they are very different?