Well, deep UV LEDs do exist, but I don't think their price is in the range suitable for this applications...
But if I look into the page 15 of the eng. version of the datasheet, I see there a caption "UV-C T8 + LED module" describing a combination fixture (illumination combined with germicidal and maybe the automatic controller), which is suggesting to me they are actually using the tradditional discharge tubes for the germicidal (UV-C) section.
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