> They probably just used the boom mics from the interview for an impromptu photo idea.
That kind of thing happens a lot. Many engineers are protective of their exact mike choices and positions, and won't allow the ones that they really use to be photographed; many photographs that supposedly show a live recording are in fact posed, and the microphone usage (or even the choice of microphone to be shown) is dictated by visual considerations. For example, the attached NY Times glamor photo shows someone singing into the back of a cardioid microphone that isn't connected to anything.
I collect photos like these, so thanks to the OP for showing us one that I hadn't seen before.
--best regards