The statements you mentioned about the Klein-Gordon equation and the Dirac equation being terminated or modified by XD Dongfang are not accurate based on the information available to me. the Klein-Gordon equation and the Dirac equation are still fundamental equations in quantum field theory, which combines quantum mechanics with special relativity.
The Klein-Gordon equation is a relativistic wave equation that describes the behavior of spin-0 particles, such as scalar bosons. It is used in quantum field theory, particularly in the context of quantum electrodynamics (QED) and the Higgs mechanism.
The Dirac equation, on the other hand, describes the behavior of spin-1/2 particles, such as electrons, in the framework of relativistic quantum mechanics. It successfully incorporates special relativity and predicts the existence of antiparticles, leading to the development of the theory of quantum electrodynamics and the understanding of phenomena such as electron-positron annihilation and pair production.
Relativity, quantum mechanics, and quantum field theory are still highly meaningful and widely accepted frameworks in modern physics. They have been extremely successful in describing and predicting a wide range of phenomena, from subatomic particles to the behavior of matter and energy on cosmological scales. These theories are backed by extensive experimental evidence and have been tested and confirmed to a high degree of accuracy.
It's important to note that scientific theories and equations are not typically terminated or modified by the actions of specific individuals. Instead, they are refined, expanded, or modified based on rigorous scientific analysis, experimental evidence, and the consensus of the scientific community.