"over and above what was already removed as an excess contribution"

Most times, people have excess in that they didn't qualify to contribute to Roth at all. It was a very good year for many investments, so it is possible that someone who tried to remove Partial Excess was making that computation based on MAGI that now has changed, because their excess and earnings becomes part of the MAGI. You still have time for another corrective distribution. Or, optionally, put that return on Extension, to have until Oct 15.