I think the personal stories and accounts are THE most powerful thing in helping people leave. It puts a human face on the harm being caused and people can identify with it and maybe see parallels with things going on in their own lives and congregations.
Few people join the JWs because of the reason of the belief system (it's devoid of reason). They join for personal / family reasons and these are why people also eventually leave. Personal accounts of harm and injustice are less threatening to watch than apostate material attacking their beliefs but also more convincing. There's no need to attack their beliefs, I don't most of them even know and believe what they are.
Silence about it helps the WTS because it allows them to keep people isolated and suffering in silence. Talking about it lets people see that we are not just a few isolated trouble makers or whatever label they want to invent. It's a mass of people who have been hurt by their bullshit policies and if it helps spread the word about what they do and how they behave in an accessible way then it's a good thing.
I think the great thing about these sort of videos is when someone starts the wake-up they realize they are not alone.There is large community of exjws
Yes, it helps people avoid thinking it's "them" who have failed to fit in. No, it's the WTS and you're normal to feel like you do and are not unique. In fact, you are the normal one for waking up and leaving because most JWs do, eventually.
That's a powerful message.