Of course you don't need 3 crew. The FTL states quite clearly that you must a) require more than 2 crew and b) cross more than 6 time zones to be classed as an ULH flight. It is not a) OR b) but a) AND b) to be considered ULH.
The FDP is less than that required for 3 crew therefore it is a normal operation albeit requiring physio rest. These FTL's were writtena after a great deal of research and discussion and circadian rythm was very much at the centre of this and the rules do in general work well - pity they're about to change!
As someone else says do you really think they would roster this flight illegally?