Unless the $20 Prismo can amplify the user-generated pressure somehow - I cannot imagine how, especially at that price - the problems to get to the required espresso pressure are still 1) the amount of force you would need to apply to the plunger & 2) the lack of capability of the Aeropress's plunger seal to hold at that high pressure.
What pressure am I referring to? The Specialty Coffee Association of America (SCAA) defines espresso as “a 25-35ml (0.85-1.18 fl oz) beverage prepared from 7-9 grams (0.25-0.32 oz) of coffee through which clean water of 195°-205°F (92°-95°C) has been forced at 9-10 atmospheres (128-142 psi) of pressure, and where the grind of the coffee is such that the brewing ‘flow’ time is approximately 20-30 seconds.”
1) Minimum brewing chamber pressure = 128 pounds per square inch. The Aeropress's cylinder is 2.25 inches in diameter, so the surface area of the flat plunger is 4 square inches (pi*R^2). Which means we have to sustain at least 4*128 = 512 pounds of force on the plunger for 20 - 30 seconds of fluid flow to make espresso.
a) we can apply this amount of force (hire a sumo wrestler to balance on top of the plunger, or put the Aeropress under one side of a teeter totter near the middle while we sit on the the tip of that same side, or something)
b) 128 psi is the minimum pressure needed to open the Prismo's valve for steady flow
c) the Prismo's seal to the Aeropress holds at least 128 psi without leaking
d) the Aeropress's plastic cylinder wall can handle at least 128 psi without bursting
Then the Aeropress's sliding rubber plunger seal needs to handle at least 128 psi without leaking.
I know from personal experience - my own as well as others - that this plunger seal leaks during normal use (Maybe up to 40 pounds of plunger force? So 10 psi.) after a few years. So I am certain even a brand new plunger seal cannot handle 128 psi.
But with its unique higher-pressure valve and fine metal filter, the Prismo just might make a higher-pressure coffee beverage that differs positively from that made using a standard Aeropress.