I count 11, not 12, F9 v1.1 launches to date: first, the Cassiope test launch from Vandenberg ; second, SES-8, their first GTO launch; third, Thaicom-6, which just missed a '13 launch; fourth CRS-...
I'm surprised Mr. Dumbacher would conflate the complexity of the RS-25 with the Merlin engine, though to be fair to him nothing in article shows Mr. Dumbacher to have been specifically addressing...
I think you're improperly conflating LEO and GTO. Antares would require much more than a 20% first stage boost to put anything reasonable into GTO, super synchronous or otherwise.
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