Pedantically, if you MFU, the ticketed class is U, isn't it?
The booked class IIRC used to be B if you booked a T fare and Y if it was a W fare. However, now I think it books in to Y regardless. Either way, yes, it books in to a TP earning class - 20 TPs and 100% miles (plus any tier bonus). If it posts correctly that is