Not talking about politics specifically at work (which is the scope they were addressing of which is pretty concretely indicated two sentences later with "work

Not talking about politics specifically at work (which is the scope they were addressing of which is pretty concretely indicated two sentences later with "work is work") does not mean they never talk about politics at other times in their life. Also not talking about politics doesn't mean not engaging with politics at all. One could still be listening, thinking and voting which means not simply embracing the status quo despite not talking about it readily.