My interpretation:

• Netanyahu has already secured political control of Shin Bet (secret police) by swapping its director
• he wants full control of the IDF, but some people haven't been willing to swear personal loyalty
• most likely, the general advocate was one
• those people are now removed, one by one, with various methods

As a result, the culture of impunity can continue.

The general advocate who was jailed - she was the person who received, among other documents (likely thousands of documents), the recommendations of the IDF internal investigators about the Rafah ambulance massacre (killing of 15 paramedics and destruction of 5 vehicles).

The IDF recommended to do nothing, claiming that they did nothing particularly wrong, just made some mistakes (executed 15 unarmed medics, some at close range with their hands bound, and tried to conceal the deed).

I don't know what she would have done, but my reading of the background and signals suggests she might have recommended criminal charges. That would have made her removal absolutely vital for the Netanyahu regime.