This study investigates the impacts of thermochemical models on the characterization of radio communication blackout around a Mars atmospheric entry vehicle. Two models, at wo-temperature model and an electronic state-to-state approach, are employed to simulate the thermochemical non equilibrium field surrounding the spacecraft. The simulations highlighted key differences in temperature profiles, electron number density distributions, plasma optical properties, and communication signal propagation. The results reveal that the multi-temperatu remodel, while computationally more efficient, underestimates the critical flow field properties, such as electron productions along several lines of sight in the wake, particularly at earliert rajectory points in which the non equilibrium effects dominate. The major difference was observed in predicting the recombination of electrons with charged ions. It also overe stimates the peak temperatures along the stagnation line by up to several thousand Kelvin. Consequently, plasma optical properties and ray tracing analyses demonstrate that the two-temperature approach severely underestimates the degree of communication blackout compared to the reference state-resolved thermochemical model.