Is it still thermally stable after a low-speed journey through a long (? Hard to say how long it is, or if you just plonk it into an open kettle of water as there are only close ups) narrow plastic tube? And what about cold water already in the tube?

If thermal stability is important enough to make such an advertising claim, you should probably show a comparison of input temperatures where the water meets the coffee over the course of multiple cycles against a representative competitor. With actual data rather than stylised cartoon graphs like in TV adverts for washing powder or whatever.

Woolly claims like that without clear evidence really make sound like audiophile woo territory, which would be a shame if you've actually done the research!