That is not necessarily a contradiction. The reason that liars add detail is to mimick truth tellers, so it makes sense that truth tellers add details as well. The important difference is that truth tellers do not need to remember the details, because they already remember them, whereas the liar needs to remember the new details.
Having said that, as a lay person, I would be concerned about false positives. Memory is associative, so even with a truth teller, I would expect more detailed and accurate recollection when told in chronological order then reverse-chronological order.
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That is not necessarily a contradiction. The reason that liars add detail is to mimick truth tellers, so it makes sense that truth tellers add details as well. The important difference is that truth tellers do not need to remember the details, because they already remember them, whereas the liar needs to remember the new details.
Having said that, as a lay person, I would be concerned about false positives. Memory is associative, so even with a truth teller, I would expect more detailed and accurate recollection when told in chronological order then reverse-chronological order.