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Depending on where you read the site it either sounds like they're using the off the shelf lens' or ones that have been designed for this project specifically.
The usefulness of arrays largely depends on what your task is. The Dragonfly is low resolution faint material where you have a large sensor and reasonably short focal length. 48x400mm F/2.8 is far easier to make than a single 400mm F/0.404 lens.
Officina Stellare make 800mm F/3.8 astrographs. Building 100 of these, dual mounted on ASA DDM160s in a large shed may cost about $100 million Aussie. Would this be cheaper than a single 8m F/0.38? Maybe, maybe not. Designing such an instrument would be a nightmare beyond all comprehension.
Yes, it maybe limited to Mag 28, but it would hit it pretty damned quick.
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