Epidemiologists also talk to economists and other healthcare professionals, and are considerably more likely to be familiar with studies on short and long term health impacts of economic downturns, stress induced by disruption, cancellation of non-critical medical appointments etc than the average smart layman...

Not to mention the fact the core competency of an epidemiologist is statistical analysis and predicting human behaviour with mathematical models at a high level of abstraction, so it's not like the interdisciplinary understanding is a stretch for them