For a person in the field the title conveys a lot: It is a way to make qubits with traditional cheap scalable manufacturing techniques and, surprisingly, the qubits can work at relatively high temperatures that do not require 400k$ cryostats.
$400k seems to be around what the helium recovery and liquidation to support medical imaging costs, but presumably at a far higher power than a $400k .1Kelvin cryostat.
4K is "liquid helium" temperature, as used in medical imaging. It is *relatively* cheap. Sub-1K is achieved by an out-of-equilibrium mixture of Helium-4 and Helium-3 (a much rarer, very expensive isotope). This is why sub-1K is much more expensive than 4K cryostats, for a given cooling power.
Yes this (plus using quite common machines to build/make a quantum computer)
I think this translates to "technique to build a quantum computer using traditional silicon, maybe"
Integrated circuit qbits and readouts operable at surprisingly "high" temperatures.