I think this Wikipedia quote is more informational

The term "tankie" was originally used by dissident Marxist–Leninists to describe members of the Communist Party of Great Britain (CPGB) who followed the party line of the Communist Party of the Soviet Union (CPSU). Specifically, it was used to distinguish party members who spoke out in defense of the Soviet use of tanks to crush the Hungarian Revolution of 1956 and the 1968 Prague Spring uprising, or who more broadly adhered to pro-Soviet positions.[7][8]

The term is also used to describe people who endorse, defend, or deny the crimes committed by communist leaders such as Vladimir Lenin,[9][10] Joseph Stalin, Mao Zedong, Pol Pot, and Kim il-Sung. In modern times, the term is used across the political spectrum to describe those who have a bias in favor of illiberal or authoritarian states with a socialist legacy or a nominally left-wing government, such as the Republic of Belarus, People's Republic of China, the Democratic People's Republic of Korea, the Republic of Nicaragua, the Russian Federation, the Republic of Serbia, the Syrian Arab Republic, and the Bolivarian Republic of Venezuela. Additionally, tankies have a tendency to support non-socialist states with no socialist legacy if they are opposed to the United States and the Western world in general, regardless of their ideology,[4][11] such as the Islamic Republic of Iran. https://en.m.wikipedia.org/wiki/Tankie