I checked my ITA letter a moment ago, I was invited under CEC, so I had no PoF to show. But if you remember, I made this mistake with this arranged employment points that I claimed but wasn't entitled to.
The placeholder "POF" wasn't there until I changed my "no" to the very first question of the intended work section like you suggested. Placeholders for "offer of employment" and "letter of employment" disappeared, and 'PoF" appeared. That's why I wondered if my category changed too.
I guess I'll just write that in my explanation letter.