Not so much the FCC, but who in the Sam Hell complained to the FCC about the opening ceremonies?
Anything is possible.
I did not watch the opening ceremonies, but the actual ceremonies supposedly featured "authentic" greek nudity, at least to the extent of a number of topless women in part of the official cast.
Don't know if this was televised, or how it was handled if it was. But my guess is that the complaint is about explicit nudity.