This is all very good information. LoRa should be good for APRS use since for the most part, only location data and station (Amateur radio call-sign) data is transmitted in APRS and thus this is a very low data rate, intermittent-use application which LoRa is intended for by design.
I was also surprised to see that per the presentation, the use of LoRa on 915 MHz requires no license by the users. Since all use of the RF spectrum below 300 GHz is regulated by the FCC in the US, this means that the use of LoRa must be licensed by statute, if true. Since 902 MHz to 928 MHz is protected for use under part 90 (commercial and public service use) on a primary basis with use also allowed by amateur radio operators on a secondary basis, this leads to only one conclusion that I can think of that would make the use of LoRa for unlicensed commercial use on 915 MHz possible. The commercial implementation of LoRa must be licensed by statute under part 15 (low power devices below 100mW power). At 915 MHz, long range low data-rate use at 100 mW is feasible. But it’s probably a good guess that most if not all amateur radio LoRa digipeaters probably operate at fifty to five-hundred times that much power (5 to 50 watts transmitted). In such a system, only an amateur radio license (under FCC part 97) or a part 90 commercial or public service license would allow legal operation and the amateur and commercial systems would need to be completely separate from eachother and not capable of communicating with eachother. Going back to the Librem 5, this would allow the legal use of LoRa in an m.2 modem card at very low power for every unlicensed user and at as much power as the modem card can possibly put out for amateur radio users. But access to any part of the amateur radio mesh network would be prohibited for unlicensed users in such a case. The use of such an m.2 card in the Librem 5 would then require an implementation in either hardware or software, of a separate network with no node in that unlicensed network being capable of transmitting more than 100 mW of power. Whether or not a user could obtain a part 90 (commercial or public service) license for a higher power use of LoRa at 915 MHz is a good question. In certain circumstances, it may be worth giving up access to traditional cell phone communications, in exchange for access to a LoRa network, especially as meshes fill in. Given the much greater advantages of higher power handsets and access to high power mountaintop repeaters, the first practical uses of LoRa in such a case will probably occur in the amateur radio community if a good consumer application surfaces. In the early cellular systems, towers were very far apart and you needed a phone mounted in your car and a good rooftop antenna to reach the tower. As the number of subscribers increased, it became economical to put cell towers almost everywhere, making all communications in those same systems be low power, shorter range communications. Perhaps the LoRa systems will develop similarly.
Another thing to consider is the restriction to relative line-of-sight radiowave propagation at 915 MHz. If you transmit a signal of 10 KW in to a mountainside you’re more likely to start a fire where the signal hits the mountain, than you are to have your communications be received from that same signal on the other side of the mountain. This might be a bit of an exaggeration, but not by much. Even at 440 MHz at only 5 watts, you generally can’t make out of your own neighborhood without a repeater unless you live on a large hill. On a flat terrain at 100mW at 915 MHz and without a mountaintop repeater, only your nextdoor neighbors will receive your signal. That is why no license is required. Even with much more power, but without a mountaintop repeater, your signal will go nowhere that will be received. Altitude is everything and increased transmitting power only helps marginally. A 100 mW LoRa signal from a parabolic dish might even be detectable on the moon if there was anyone there and a big enough antenna there to receive it.