There is a difference between invasion and migration though, AIT has long been debunked, the current consensus is AMT
The Aryan Invasion Theory was propagated by the British to justify their colonial brutality, and no self-respecting historian will now call the gradual Aryan migration an invasion. The only people who still do are usually trying to achieve some political aims, usually imperial apologia.
Source: Edwin Bryant in https://archive.org/details/EdwinBryantLauriePattonIndoAryan...