They're referring to a niche academic term that has within the past few years started gaining usage outside of academia. It can be approximately defined as[0]:

They're referring to a niche academic term that has within the past few years started gaining usage outside of academia. It can be approximately defined as[0]: > The use of mass public communication, usually against a particular individual or group, which incites or inspires acts of terrorism which are statistically probable but happen seemingly at random. [0]: https://en.wiktionary.org/wiki/stochastic_terrorism https://en.wiktionary.org/wiki/stochastic_terrorism Only very loose connection to the stochastic processes of mathematics.