I do not agree with such a wording. To begin with, a lot of work was done on the choice of a suitable donor watch. Was conducted reverse engineering. As a result, I as a consumer got completely ready-to-work smart watch on Espruino + support and software updates for a specific watch model.
Honestly, I personally have no time to do this. I think, like many other users. And this information (with the donor) was known from the very beginning.
Why sell a watch if you only change the firmware?