I don't understand your question. The link provides the statement by a reputable scientist that chemical reactions obey E=MC2 just as nuclear reactions. In both cases, mass is created into energy. When you burn a gallon of gasoline with oxygen, the total mass after the combustion is less than before the combustion. Same with batteries. The energy derived from batteries was originally mass.
Fire...which we commonly call burning consumes oxygen by combining oxygen in the air with the carbon in the wood releasing chemical bond energy stored in the cellulose (mostly carbon and hydrogen ). Stars do not "burn" in the same sense, since they do not use oxygen nor do they need it. The reaction is completely different. It is driven by the action of immense gravity on the mass of the young star...if there is enough mass, the gravity will crush the atoms together and with enough mass the atoms are crushed together enough to fuse them...every 4 hydrogen atoms are fuse to create 1 helium atom and
since 4 hydrogen atoms weigh a little less than 1 helium atom the balance of mass is made up by the energy released. We compute the difference in mass converted to energy by the famous equation E=MC2
Peter Faletra Ph.D.
Assistant Director
Science Education
Office of Science
Department of Energy
I still couldn't absorb your education on chemical reactions obeying E = mc^2.