Hey I wrote this :-) But back in 2016 or 2017, so some of the practical stuff might be out of date.
Edit: it seems DASH7 is more widely deployed and apparently LTE-M is being pushed by telecom for IoT using existing 4G towers
EDIT: This gives a great overview of all the available LoRaWAN devices out there: https://www.thethingsnetwork.org/device-repository/