Yes. No. Perhaps.

There's a bit of hype going on here, which is a shame, because the calibre of Camille's performance stands without it.

World records are recognised at particular distances, and in the case of ultras also particular durations.

So while Camille has become the fastest woman to run 900km, it doesn't make it WR. Sure, we know for certain she's the first woman to run 900km in under 6 days, and the organisers may have even measured where the 900km point was on the loop course and taken her time as she ran by, but it's not a WR as such.

It's like saying Kiptum holds the WR for 40km because we had a timing mat at that point of the marathon. Or saying he holds the 2 Hour WR of 41.756 km, because that's where he was at that point in time when he ran the marathon WR.

As for an American road record at 48 hours. Since the IAU merged its road, track and indoor ranking lists in 2015, there is only a single record for each distance or duration, regardless of the surface. Provided it was run on a certified course.

For ultras, "Road records" and "track records" no longer exist. Barwick doesn't get credit for still holding the 6 Day track WR record, just like Camille hasn't run an American 48 Hour road record.