Does anyone know what this product is based on? Is it just a ready-made image with all the bridges preconfigured (and prerequisites such as a small android vm for a viable whatsapp bridge), or has there been some evolution on the existing package? Is there documentation on what was done to achieve this?

Purely on the content of the article: Given that the messages are not stored encrypted locally and that this service is connected to the US, I do not see how it can be viable for the privacy-conscious.