Not specifically. Photoplethysmography just means, roughly, light based volume measurement. It can measure pulse when done crudely. If you have a baseline for blood pressure and a sensitive enough PPG sensor you can detect different levels of volume and infer pressure. It is analogous to measuring water pressure based on the diameter of a filled rubber hose.

To the GP's point, the largest blood pressure monitor company is Omron. Portable monitors have been around. https://www.omron.com/global/en/technology/omrontechnics/vol... is a good place to learn more about the advantages and disadvantages of different approaches. Piezoelectric and PPG would have the advantage of lower cost, lower mechanical complexity, and continuous monitoring instead of point measurements.