Seems more like Ars trying to avoid piling more attention on the name of a person that isn't actually involved.
And again, the accusation against Archive.today isn't just that they removed their "Nora" alias from a snapshot, but that they replaced it with the name of the blogger they were quarreling with. There's no defensible reason to do that outside of petty revenge (which tracks with the emails and public statements from the Archive.today maintainer).
They apparently did a find + replace across their database to change the Nora alias to the blogger's name. So any archives of content referencing her would instead point to him, muddying the waters and blaming him for anything she was accused of. Like I said, petty.
And again, the accusation against Archive.today isn't just that they removed their "Nora" alias from a snapshot, but that they replaced it with the name of the blogger they were quarreling with. There's no defensible reason to do that outside of petty revenge (which tracks with the emails and public statements from the Archive.today maintainer).