Are all the History of Maiden Documentaries Already Filmed?

Great Sage

Invader
The Early Days and Live After Death segments were obviously filmed at the same time around the Dance of Death era. I'm thinking that any future sets of interviews are already done at the same time, which will be weird to watch 10 year old interviews with the next release. In some ways it would maybe be better as memories were 10 years fresher back then but I will still find it very slightly jarring.
 
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