Schweser V2 page 332 third afternoon exam Q35, why Rawline’s trade is not classified as curve adjustment strategy?

what’s the difference between yield pickup and curve adjustment, from the question, how can we derive it is using yield pickup but not curve adjustment?

Also It mentions Tejada is using total return approach, but it mentions only that Tejada is using some statistical model, does it mean yield pickup strategy will not use statistical model? By using statistical model, how can we derive it is using total return approach?