The "One Stop per Decade" Rule

We are getting close to launching our expired film project. However, Bill still has questions about the horde of expired film Fujifilm Rep, Brandon Remler, has given him. In our discussions with several photographers, we've received numerous recommendations on how to shoot expired film. However, one recommendation has stuck, "Overexpose one stop per decade."  To get confirmation, we reach out to EM (emulsive.org) to see if this 'rule' is legit or is this just a saying that has stuck over the years.