Wrong. Dynamic pressure is a theoretical concept, a convenient reference pressure for calculating aerodynamic coefficients. The real pressures generated in compressible air make the airplane fly.
Dynamic pressure is also an empirical fact. It is the kinetic energy per volume unit of air. The more dynamic pressure, the more Lift, the more Drag, etc... And that is why you need to know it, because the aerodynamic forces depend on it. Real air has dynamic pressure.
When compressibility effects become noticeable then you need to know your mach number, too, because it will affect aerodynamic forces and set your limits before dynamic pressure does.