There's no way Apple would design any device which would, I quote, "insert a thin, sterile filament into the skin" to draw interstitial fluid. The Abbott sensor is designed to be worn for weeks on end.
E.g. https://iopscience.iop.org/article/10.1088/1757-899X/104/1/0...
https://appleinsider.com/articles/21/07/14/apple-supplier-la...
"Rockley Photonics says that its system uses infrared spectrophotometers to detect and monitor a wider range of health issue than the green LED systems in most wrist devices."
I also remember paging through this fascinating investor presentation document from Rockley:
https://rockleyphotonics.com/wp-content/uploads/2021/06/Rock...
HN discussion from a few months ago on this specific topic: