Unusual in that it has an upright bass bridge setup and quite a radius'd fingerboard
It's not radiused enough to play arco. Also the string spacing is much narrower and is more like a bass guitar's.
Its as big as an upright, so I wonder what the logic was behind it?
Much cheaper and easier to produce as a flat-top than a "real" bass. But as a result, it doesn't sound quite like an upright, more like a loooong scale fretless ABG.
Playing it must be very different from upright, with its neck block at the 14th fret, compared to an upright's 7th or 8th "fret" neck block. So no block position, and no thumb position.
Also, from the way the guy in the video is toying with it, it probably weighs not more than 1/4 the weight of a real upright. This also has an effect on sound.