Reducing the impact of the bus factor, then. Kind of like turning down the air conditioning... which way does the thermostat go?

I guess he/she is using the alteration of the definition of the bus factor:

> There is a rare alternative definition for the bus factor, namely: the number of people who are indispensable for the project. In other words, it is the minimum number of people who are a single point of failure. If using this definition, then a high bus factor is considered a bad thing (since the loss of any person included destroys the project), and zero is considered the ideal bus factor.

Source: https://en.wikipedia.org/wiki/Bus_factor