The behaviour in the Vivaldi Upsampler is the same as in the Scarlatti Upsampler when I/O rates are the same. The output volume is attenuated by 0.1dB to match the 0.1dB attenuation incurred during interpolation (filter ripple). It isn’t strictly speaking a filter - the connected DAC always has to do its own filtering, the same as if the Upsampler was not in the chain, so no use doing it twice as you suggest.
(on a completely unrelated note, the 0.1dB attenuation may actually help with intersample overs if they are present in the recording)
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