From my reading, they didn't seem to claim that all scientific progress has been slower, just fundamental advancements and theory, c.f. "...the pace of fundame

From my reading, they didn't seem to claim that all scientific progress has been slower, just fundamental advancements and theory, c.f. "...the pace of fundamental innovation, the kinds of theories and engineering practices that will feed the pipeline of future progress, appears, to some observers, including us, to be slowing..." That's not to say that we haven't accumulated a tremendous amount of knowledge and techniques, but our findings don't seem to be simplifying in a way that makes them easier to understand.