As they are only Atmega328P mcu, they are unlikely to be able to hold a full LoRaWAN stack and provide something useful. Also, the HopeRF modules on there are not, in my experience, great. I’m not sure if the chip on there is an actual Semtech SX1272, a licensed copy or a knock-off compatible clone. The datasheet appears to be based on the SX1272 but with slight variations in places from when I initially looked at these almost a year ago.
There are a number of other mcu options that would be more capable, for example if they came with the Atmega1284P or one of the low power Arm based mcu from STMicro or Freescale then these might be a better option if you were to design your own if you’re capable.
For now I’m sticking with ready made modules and designing for these as I dont have a need to go to a tiny scale device just yet.