No, afaik they don´t call it a "linear" power supply. It is mentioned on the website that it incorporates a "linear regulated constant current" charge circuitry. If i´m not mistaken, the idea behind these supplies is that the capacitor banks were charged and intermittently switched in and out to provide the dc to the external device, which is therefore intended to be "totally isolated" from any circuitry before the capacitors.
That is the theory and ideal that is being sold to customers with nary a measurement to demonstrate it.
Real circuits don't work that way. Achieving that ideal requires exceptional attention to detail and design which is lacking here. Even small amount of capacitance between input and output causes mains leakage to say nothing of the emissions generated by the internal microprocessor, switching and charging circuits, etc.
I have been instrumenting the UpTone LPS-1 more and there is a ton going on in there and bleeds out. See these graphs I posted and more to come:
Does this look "totally isolated" to you? I think not.
Large currents are involved in charging the alternate bank and clearly that activity is bleeding into the alternate bank whose output is being used.
So much of customer perception is formed by these marketing statements. "Lower noise" is the first thing they all say. If they knew what they actually did, maybe the subjective remarks wouldn't be far outside of reality.