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I find it strange that you mention tri bikes vs road bikes. Yes, the unconstrained tri bikes use steep seat angles and are faster than UCI legal TT bikes, but that is because the steeper seat angle allows for a more open hip angle at the same torso angle or vice versa.
Basically when I do road or tri bike fits, I set the rider to the tightest hip angle (most aero) that is comfortable for them, and then on a tri bike the whole rider is rotated forward. This means with the same body angles and kinematics, they are more aero, thus faster on the tri bike.
Just like Joel Harwood says in the podcast, what matters is the angles and position of the rider, not of the frame.
Are you saying you read tests where the rider maintained the same joint angles, yet was more powerful or efficient simply due to the more forward saddle position?
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