This is the first time Level 3 pathogens have been imaged in this way.
The Slashdot story isn't "we've determined the structure of a virus" - it's "we've got a new way of taking its picture."
If you'd like to interpret "we've got a new way of taking its picture" to mean "we're taking its picture in a new lab with slightly different equipment from all the other facilities around the world where X-ray diffraction studies of virus are done" then I would agree with you.
They have an automated BSL3-level end-station on a beam at Diamond, so that viral crystals of pathogens can be studied. Apart from it being new at Diamond, there is nothing "first time" about this arrangement.