Clearly, the regulator valved burner can run at a lower pressure than a conventional burner.
That would depend on the BTU rating for the stove the Sotto is being compared against. The regulated valve on the Sotto appears to have a large diameter orifice designed into the valve to allow low pressure gas in the same way a higher BTU rated conventional stove has such as the Coleman F1 Power will have when the needle control is fully retracted. The Coleman is also a good cold weather stove (for this type of gas cartridge stove design) and will also have that 2-5F advantage over other less powerful stoves. You just have to be careful to turn the valve control down when your gas cannister suddenly gets 70F warmer in the matter of a few seconds.
The comparison stove being a Snowpeak Giga stove is rated for around 2.9kW i.e. it is lower rated than even the official Soto BTU rating. Essentially, I suspect that the Sotto is a basically a 7kW or even higher rated stove (valve design) which is output limited via valve regulation to 3.5kW output at the burner.
The Sotto stove does appear to be a well engineered product. My only concern is that these demonstrations and marketing videos could lead some folks to expect cold weather capabilities which really are not there in the design and could catch some folks out when they really need a hot meal and don't know the tricks to get the stove working again.