As far as the post suggesting the opposite, it does not appear to be backed up by any published policy. If they do credit it in practice, then that's not something that's promised anywhere from what I can see. TrueBlue specifically says Base Fare on the earnings chart.

Because the fuel surcharges (for now) only appear to be charged on translatlantic flights, domestic bookings don't have this issue. But also realize that they'd be throwing away their entire rewards program if they did that.