I would bet IT Department is just one of the lead scientists that happens to be decent with computers. A LOT of these folks already have to know python etc. And yes, I understand that its a totally different field from infra/ops/ and even security, but to these folks, its good enough sometimes. Having worked IT for a research institution, they can be fun to deal with, and take great personal ownership over their projects, data etc.
Not that I blame them to some degree, many of them are funded on grants that are highly scrutinized. They want to put every grant dollar to work on advancing research. Some even will personally handle/transport the datasets. For example you can see Shep Doeleman, the Director of the Event Horizon Telescope (EHT), do exactly this in the documentary "The Edge of All We Know" about black holes on netflix.