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They specifically chose the EF 400mm f/2.8L IS II USM for its optical quality - not just any old 400m f/2.8 lens. The noise they are trying to minimise is optical noise from scattering and internal reflections and apparently this lens excels in this regard. BTW it weighs "only" 3850g.
By combining in a large array they create an effective f-ratio much lower than a single lens but without introducing the optical problems of a single large lens of the same f-ratio: total aperture divided by focal length. I didn't see it said explicitly but assumed that to obtain the effective f-ratio the cameras must all be synchronised so that stacking of the simultaneous images would work to reduce the optical noise.
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