I had missed this announcement, which was in 2021. It applied to some 10M records where the DoB is before 1940. This means all WW1 and WW2 records, and presumably up to approximately 1956. The announcement does not say how access may be given before a blanket 115 year cut-off. It looks like they have "made up" the 115 year rule to cover the oldest of soldiers, rather than to comply with any privacy regulations.
NA say they will make further announcements in time - but the scale of this move, and the indexing effort must be huge. I cannot see that there will be any motivation to scan these in bulk, so any document inspection will be at Kew, or pay-on-demand to have an individual record scanned. As we know, military records can be quite LARGE.