It cannot support,it was not from the officials and cannot be determined,the third new civs why not have the huge picture,maybe the third icon replaced the Indian instead,and I cannot find any infomation for rename Indian.Why bengalis and dravidians have but Gurjaras do not have?It is strange!
It’s very comparable as the reason could be balance which also resulted in many other civs getting units like knights that they didn’t really use.
The game has never been known for historical accuracy and I’d be surprised if that suddenly changed now.
E.g. the Koreans also had no horse-drawn “warwagons”, nevertheless it’s their UU.
The Persians also had no elephants but recruited Indian Mahouts to fight for them - yet the strongest elephant in game is their UU.
Why do you need a source? Literally they were like every other feudal society in terms of military. They had a very similar army to the Poles according to wikipedia:
" When the Commonwealth was formed, there was little practical difference between the Polish and Lithuanian armed forces but they were kept separate; "
The War Wagons are both based on something Koreans actually used and also represent the Korean playstyle
What you are saying is like making a Hussite civ and giving them as a UU the “Czech Knight” or something like that.