As I understand it , there are static condensers and dynamic condensers , the only difference being , the dynamic condenser has a fan to circulate air thru it for faster cooling or flash freezing , both units still require a Compressor to compress and circulate the refrigerant.
So technically the only difference would be the addition of the fan , so I would guess that an external control would work fine with it.
Thanks for posting this , I am looking for an upright freezer , that is a great price , I will be ordering one.