These are depositions, not the witness stand. These can be very long and open ended (and really boring). The problem for the WTBTS is everybody talks eventually, the problem for the prosecution is what the WTBTS attorneys will be able to seal or limit before it goes onto the witness stand (or public access). Basically the deposition is the long form version to discover what they will be able to ask you about on the witness stand, after depositions, both attorneys and the judge have to go through it and agree on what can be admitted, then the case still has to get resolved before it will become public.
The problem for the ex-JW movement is that this won’t move the needle for true believers, even if you had video evidence of them admitting serious wrongdoing, at best you’ll get someone saying it’s fake and those are not the real leaders of the JW, at worst they’ll say it is theocratic warfare and they are permitted to lie because more than likely the witness stand is where the Witnesses will lie and commit perjury (that is where the depositions and witness stand testimony conflict), then you still have 2 versions of the story, one where they said something in a 36 hour long video recording, one where they said something on the stand and then the story will be ‘the persecutors of this world didn’t like the truth so convicted them of perjury’.