Without LongHorn's official cooking guidelines, it is not possible to determine which statement about the LongHorn Salmon is incorrect. Culinary practices can vary and without accurate reference, any answer would be speculation.
The question posed seems to ask which statement is not correct concerning the preparation or cooking instructions for a LongHorn Salmon, which is likely a menu item from a restaurant like LongHorn Steakhouse. However, to accurately determine the incorrect statement, one would need specific training or an authoritative source from the restaurant outlining how the salmon should be prepared. Without this reference, it would be speculative to select which option is incorrect since the preparation of food can vary greatly from one establishment to another.
Nevertheless, generally speaking, in culinary practices, the target weight of a portion (option A), instructions for when to flip a cooking item (option B), and guidelines for applying marinade (option C) are all common considerations. The precise figures provided (7oz and 10oz for weight, flipping at 50%, and brushing with marinade twice) could be correct or not depending on LongHorn's specific protocols. Therefore, without the exact standards or guidelines from LongHorn, it would not be responsible to state which of the options is incorrect.
Therefore to provide an accurate final answer, we require the official LongHorn cooking procedure or training materials. Any answer without this information would amount to guesswork, which is not suitable for educational or professional advice.