Let's be realistic here, and I am speaking for basic science. These numbers are grossly inflated. I know many HHMI investigators, and the vast majority publish 1-3 good papers per year on the average. I can give you names to "PubMed" if you don't believe me. I know a postdoc who had 1 paper in 5 years, albeit in Nature and got a faculty position. In the department I worked (at a research powerhouse), we had new hires with 2-4 solid papers in a 4-6 yr postdoc. No one had 8 or more published papers from their postdocs, maybe only one published in Nature, Cell or Science; and he wasn't even the department's top choice.
The trend I have noticed is that labs with insanely high and seemingly quality productivity can, at times, suffer from problems with scientific fraud. There was a lab in my field with such productivity, and we were always cautioned that we read any papers from that group cautiously.