I don't know that they are disappointed in their sales per se...
Last July, Ad Duplex had them as the #4 Windows handset in Japan, ahead of Vaio or even the tried and true Lumia 640. That made them the #1 Continuum handset in Japan. Ahead of Vaio and leading out before the release of Mouse Computer's Madosma Q601, both of which are in the exact same class of SD 617 powered units. Also spots 1-3 are all value phones, so they were the go to Mid-Level "Flag" for Japan.
My take on it is that they are disappointed in the "fans" of Windows Mobile. After being the darling of MWC 2016 and earning lots of press coverage to bolster their appeal, the crowd fund effort to generate enough capital to go international failed quite spectacularly.
I'm sorely disappointed in the result and I don't own the thing.