I just logged onto Namus for the first time since before this all happened, and I think it might legitimately have just been a mistake.
I track Asian Doe and Lattingtown Jane Doe in addition to Peaches and her baby, and all four of them had been modified, so I went to look at some others. Almost every single unidentified person in Nassau and Suffolk counties was modified on Sept. 5, and three others between Aug. 23 and 30.
My guess is that they are reviewing cases and taking notes of things like items that might potentially have suspect DNA (stray hairs, etc.) for testing against Heuermann/other potential suspects. This does seem to be something they do every few months, as others have noticed it before. But it doesn't seem like Peaches was singled out at all, just maybe something got misclicked when they were updating (although that could mean they have her name, and what got misclicked was that she was no longer unidentified, I guess).
That said, I vaguely remember another big batch modification right before they re-searched Manorville and North Sea, so maybe they've gotten more files from his devices and are reviewing to see if any cases match up. I could absolutely be wrong on that, and it's hard to check because so many of the profiles were just updated, but of those that weren't, three of them were modified between March 27 and April 9. And the remainder were all updated in October and November of 2023, right before charges were filed in January 2024 for Maureen's murder. So maybe there is news/new charges coming in a few weeks, and they're doing a review for anything that they can potentially add?