For a flyable prototype, yes. I don’t think the article’s small-scale proof-of-concept vehicle had any need for control surfaces, etc. Just getting the thing off the ground and in flight would have been enough for the demonstration and to heck with control-ability.
Perhaps some future BBE-propelled aircraft could actually achieve controlled flight by employing not one but several electrode arrays with each array operated individually for different thrust levels (although fly-ability would be limited). That said, I doubt the goal is to have absolutely no moving parts in an aircraft, but to create a new way of creating forward thrust for aircraft.
