The False Left opposes imperialism, whereas the True Left only opposes colonialism. Indeed, the True Left is not only not opposed to non-colonial imperialism, but in fact even supports it in cases where it is explicitly anti-colonial. Example:
https://en.m.wikipedia.org/wiki/Annexation_of_Goa#:~:text=The%20Annexation%20of%20Goa%20was,the%20%22Liberation%20of%20Goa%22The Annexation of Goa was the process in which the Republic of India annexed Estado da India, the then Portuguese Indian territories of Goa, Daman and Diu, starting with the armed action carried out by the Indian Armed Forces in December 1961. In India, this action is referred to as the "Liberation of Goa".
Anti colonial imperialism in modern times could in fact accurately be called Hitlerism.