I don't think any of us are questioning the way ice is formed (due to cold soaked fuel).
I was just trying to determine whether or not FAR121.629, with regard specifically to the B737NG had been revoked.
For those not familiar here it be....
(b) No person may take off an aircraft when frost, ice, or snow is adhering to the wings, control surfaces, propellers, engine inlets, or other critical surfaces of the aircraft or when the takeoff would not be in compliance with paragraph (c) of this section. Takeoffs with frost under the wing in the area of the fuel tanks may be authorized by the Administrator.