In order to avoid a goalpost-moving exercise, what is concrete the working definition of jet you feel most pilots would agree with? Is the difference between th

In order to avoid a goalpost-moving exercise, what is concrete the working definition of jet you feel most pilots would agree with? Is the difference between that and this as trivial as "has an ICE"? From an engineering perspective, if something produces thrust primarily by producing a jet of surrounding matter (water or air) and taking advantage of Newton's third law, I'm not sure I see the issue. There's no exposed airfoil, and it doesn't appear to care about Bernouilli's law (except for lift).