No. The link is to an oil trading company, not a technical source, and the reference provides no source for the information.
"Maximum burning temperature", is not a standard measure for specifying jet fuel. Jet fuel specifications from ExxonMobil list many requirements and test methods, but do not mention "maximum combustion temperature", or any similar property.
The highest temperature attainable when burning a fuel is known as the "Adiabatic flame temperature". Wikipedia provides a very good explanation, including:
The constant pressure adiabatic flame temperature is the temperature that results from a complete combustion process that occurs without any heat transfer or changes in kinetic or potential energy.
Based on the article, the reported maximum flame temperature of 980 °C is much too low, because
In daily life, the vast majority of flames one encounters are those of organic compounds including wood, wax, fat, common plastics, propane, and gasoline. The constant-pressure adiabatic flame temperature of such substances in air is in a relatively narrow range around 1950 °C.
The Wikipedia article on jet fuel gives an adiabatic flame temperature of 2,230 °C.
A source referenced in the Wikipedia article gives a value of 2300 K (2030 °C).
The maximum adiabatic flame temperature occurs when the air to fuel ratio is exactly right for complete combustion of the fuel - enough oxygen to completely burn the fuel with none leftover. This is called stoichiometric conditions, or zero excess air. In a large, uncontrolled fire within an enclosed space, it is expected that there will be some regions where the air to fuel ratio is higher and others where it is lower than stoichiometric conditions, and in between these there will be some regions with perfect stoichiometry. Therefore temperatures will not be uniform, but some regions may be very close to the stoichiometric flame temperature.