Yeah, that's because the anomalies were added long after the ruins, so Steve never modified that button. Might be a good idea to put this up in the C# suggestions thread.
Alight, well, for future reference I took a risk and tried it myself. The answer is: When you use the "Redo Ruins" SM command, it does NOT alter the existing planetary anomaly.
Hey all. So if I select the "Redo Ruins" option in SM mode, does that ALSO rerun the quality and/or type of the Alien Installation anomaly on the planet?