[rockarage]

What can be mechanically detected is limited to how the data is collected.

You missed this part: "Moreover capturing Black/Dark skin and features require more accurate light metering & lighting because dark skin absorbs more light."

I have to see the images used to train the ML model, to be certain, but based on my experience working in photography and programming, I believe it is more likely than not that they used essentially poor quality images for the training.

Moreover, after the model has been trained, to use the system effectively the facial recognition camera has to be set up to capture both light and dark skin, in the case of dark skin, it typically means not relying on available light alone indoors, an additional camera light must be provided.

The reality is if you want a facial recognition system that accurately detects dark skin it will cost a bit more to do it right.