Everyone has different interpretations of "Yes to Trades". That doesn't necessarily mean "Yes to Trading Draft Picks" as the same thing. And since it IS "very standard to allow the trading of draft picks" in Progressives.... Theme Leagues don't carry the same "very standard'' excuse.
Since we are all in the same boat, but some of us maybe drafted differently, thinking trades couldn't take place until after the draft, now it has been clearly defined otherwise, then it is what it is. I will live with it.