yes it robs torque vs. a manual, in addition to HP. Meaning there is a net loss with a tip.
I think that if Porsche had completely addressed the issue, then the Excellence contributor wouldn't have cited the tip power/torque reduction as a reason to opt for the manual S vs. the tip.
I have no experience driving a tip. BUt I have driven paddles and I can say that these are inventions of the Devil which have ruined motorsports. But Great if you're an older guy or have physical limitations.
Hopefully someday I'll find that Ferrari 360 coupe with NO paddles.