I'm not sure if the device is currently being sold since they need to get the approval for any medical devices. For results and accuracy please check their papers from several years back [1], [2]. I think may be you are right, for transparency they need to release all the accuracy, sensitivity and specificity of the non-invasive glucose detection device, and from the publication title it seems only sensitivity results are currently being published. Personally I have one patent pending on non invasive ECG anomaly detection that cover both arrhythmia and ischemia with comprehensive 99% accuracy, sensitivity and specificity, and high accuracy of non invasive detection technique is certainly achievable.

[1] Microwave Noninvasive Blood Glucose Monitoring Sensor: Penetration Depth and Sensitivity Analysis (2018)

https://ieeexplore.ieee.org/document/8428850

[2] Microwave noninvasive blood glucose monitoring sensor: Human clinical trial results (2017):

https://ieeexplore.ieee.org/document/8058721

In order to bring a CGM to market, in many areas of the world you need to perform a number of clinical trials, and a certain MARD upper bound has to be demonstrated. Also, during development certain ISO/IEC standards must be followed, which cover continuous medical & information risk assessment and mitigation. It’s usually a process of up to a few years even after you have a strong belief that it performs well enough.