What is TBD power, TBD power, TBD
While "TBD" can mean a range of things, and the usage in the article cited was very sloppy, in the context,  TBD stands for "time to breakdown".

A good example of the usage is given here


" ... Understanding the influence of antifuse bitcell dimensions the programming time and energy using an analytical model: ...   The model yields the time-to-breakdown and the wearout current as a function of the programming voltage and the dimensions of the antifuse bitcell. As a main result, it is demonstrated that a device with a small capacitor area exhibits shorter TBD, lower Iwearout, and hence a lower programming energy. Characterization and modeling are performed for a programming voltage range from 3.5V to 7V with a minimum TBD of 9ns. ..."