Since your cellular speed is increased also, I suspect that it also integrates Carrier Aggregation too (connects to more than one cell tower (if available) and uses the extra bandwidth to improve your speed.
While super cool technology... I doubt many motorhome users will even notice the difference between 40 and 100 MBs download as even the 10MBs my current (extreme edge of range) Skinny one does is fine for Full HD netflix on 2 streams concurrently.
When 4K streaming becomes the usual, I'd say these devices will really take off.... however, then the towers themselves will struggle, so we'll all be buying "5G" modems anyway?
8.5m 1990 Dennis Dart bus, 6L turbo -4 pax
- 24v system: 2x 104ah AGM, 40A Tracer N controller, 500W solar; 1200w & 300W puresine inverters
120L grey/fresh water, 255L Samsung fridge, LPG Califont, 5KW Chinese Diesel Heater