A 10 lb structure would have to displace something like 3500 liters of air (a cube with side lengths of about 5 ft). Maintaining a vacuum with such little material is highly unlikely, to say the least. Moreover, scaling the structure by a factor of 2 increases the weight by a factor of 8. So the researcher's claim that "in order to make them flow to air, we just need to make them bigger" just doesn't make much sense. The larger the "balloon", the LESS likely it is to be structurally feasible.