There's no change in policy DarioKehl. It's just restating what is current policy. It seems curious more in its timing and how it specifies to check personal files held by elders. I believe one of the cases in Australia did have some personal files still in existence, and it showed the elders to have lied about what they knew and when. Not that destroying them makes things any better either, but then successful prosecution of criminals and the protection of the community from them isn't something the WBTS ever seems concerned about.
There have been a couple of cases in Britain too, recently, where the destruction of notes and potential evidence has been commented upon by the prosecution. Not to mention cases where they've been obstructive and generally unhelpful. But nothing new here. A restatement of fact and what already happens, and has done for years as far as I know here in Britain. In terms of current investigations, production orders have already been made by the Charity Commission. Whether this is doublechecking that everything incriminating has been torched before the British public inquiry... reasonable question I think.