Yeah the wording is awkward.
However, keep in mind all Ted markets will be priced under Ted's simplified, 6-tier fare structure.
With a comingling of mainline and Ted on certain routes while planes are being transitioned into the Ted fleet, UA
will market and sell certain Ted flights with mainline configured planes.
Some customers will be delighted as they will get an F seat, albet no F service; but, expectations that this "free F seat" will be commonplace on Ted must be ruled out... And the "operated by United for Ted" is part of that clarification.