Messages I have got from Jolla staff have all been positive regarding this Radio Switcher and nobody has asked or even mentioned anything like that.

Of course that talk is pretty much true what comes to banning devices and badly behaving cellular radios. This device however is a derivate of an Orange phone, or so I have been told by Jolla staff, and it uses Qualcomm hardware and cellular modem software which all have been certified, AFAIK. There can be interference and high radiation levels on short range because of possible differences in PCB and component layout and protection compared to that Orange product and LTE modem may require some tuning before LTE capability can be deployed.

I do not know for sure. Anyway second post in this thread was not about that this application should not be used but where to get the source code.