See
here for the Indiegogo campaign.
First formally there is a problem with the video. He says at 1:15 that it kills 99.99999% and suggesting an endless number of 9s, so basically nearly all, but the campaign text says 99.99%. But he is no scientist, has only a
bachelor of fine arts, so that explain this inaccuracy. Of course, even 99.99% is very unlikely. While
UVC light kills viruses, I don't think that the the small battery and the lifetime of 8 hours suggests allows light strong enough to do this. For example
a study shows, that UVC light can kill 99.9% viruses, but it needs 25 minutes exposure time for this percentage, and still 8 minutes for 90%. And I'm sure the light source was much more powerful, but I didn't read the study details.
Another problem is the air curtain. Again, I guess it would need to be very powerful to provide such protection, which is unlikely that the device can do it, and additionally I guess the turbulences because of the near irregular face wouldn't allow a good air curtain. And what air do you breath? Sure, the air curtain might not contain viruses, but the air coming in from the sides still have it. There is no way it could shield you 99.99% and at the same time provide enough air to breath.
It is not totally BS like the free energy scams and looks plausible if you don't think too deep about it, but I guess it would provide only very low protection, like it kills less than 1% of the viruses you breath in.