This phrase has now featured against two meetings, recorded by the RM in their 'Timeline' as having taken place. The first was chaired by a member of the CFHT and the second by a member of the BBP (on zoom I understand). If both were indeed run in the manner described by that phrase, I would have expected some progress to have been achieved. Surely the aim of holding a 'without prejudice' meeting is to allow those involved to get matters resolved. An alternative possiblity is that using WP can keep dicussions out of the public domain.
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WP essentially means you can't take what was said into a court but in the instances mentioned above it was used in an effort to keep the content away from the public rather than a judge.
The first one really ought to have made progress. It was along the right lines but a certain faction was having none of it as they would later prove. The second one was a total joke by all accounts.