I don't understand where this statement comes from. Patchick mentioned something similar regarding Anderson's combine performance. I think quite the opposite is true.
Stanford has a very distinctive strength and conditioning program which includes a lot of work on flexibility and injury prevention, but which very much de-emphasizes performance with the kind of metrics that are favored at the Combine. This program has been written up many times and has gotten a fair amount of attention from NFL teams, but in general Stanford players tend to perform poorly at the 40, BP and other measurements. The 3C is a bit of an exception, since they tend to be more flexible than fast.
Stanford players don't do weight lifting their first year, and there is as much an emphasis on yoga and flexibility training as on strength training. Strength and conditioning coach Shannon Turley used to send letters to NFL teams explaining his approach and asking them to discount performance in the standard drills. There are a ton of guys like Shane Skov (5.09 40) or Chase Thomas (4.87 40) who were considered day 2 picks who became UDFAs because of poor Combine/pro day performances, or David Yankey (5.46 40), who's combine performance helped drop him to a day 3 pick. Trent Murphy had a disappointing 4.85 40, and though he had the best 3-cone of all DE/OLBs (6.78) his combine performance was otherwise pretty unremarkable.
http://bleacherreport.com/articles/...inside-the-stanford-football-strength-program
http://www.nytimes.com/2013/12/31/s...n-redefines-strength.html?pagewanted=all&_r=0
http://www.ruleoftree.com/2014/9/11...ioning-under-shannon-turley-benefits-on-field