not neccessarily. By definition any lift without an eccentric motion is plyometric. It denotes neither intensity, nor load. However, if they're very intense plyo movements, you may be correct. I would assume that it depends on the individual's current level of fitness, nature of the exercise, intensity, etc. etc.
Basically, I think if you're ready to move up in resistance on a movement with tabatas, and you decreased in reps linearly (20 reps your first set to 10 reps on your eighth), you're doing over 100 reps in 4 minute (20+18.5+17+15.5+14+12.5+11+10 = 118.5. yes I know you don't count half reps, I'm assuming nobody here is a machine and is going to decrease in a completely linear fasion. the half reps would be made up in a set here and there). With a high intensity plyometric movement, thet may be a bit much. Whether box jumps qualify, I'm not sure.
in fact, no. I would not reccomend jumping movements with tabatas due to the strain on your joints and risk of injury. it's the same reason I wouldn't do deadlifts in this method. Due to fatigue and the impact of the movments themselves I would restrict them to different rep schemes.