Xenon has a critical point of 15.9 degrees Celsius and 841 psi and it is indeed theoretically possible that the SFT-10 SCF pump can pump this fluid. However, the solvating properties are similar enough to warrant using SCF CO2 over xenon given that SCF CO2 is approximately $35 for a 60 lb tank with a dip tube vs. xenon which is approximately $300 for a 60lb tank (you would need to get the costing locally). SFT cannot warrant or guarantee that SFT pumps can pump xenon liquid as a SCF.
Argon has a critical point -122.13C and 711 psi. Because of the low temperature, the SFT-10 SCF pumping package would not be capable of pumping this SCF.