The renaming comes from the attached paper where
Ligustrum nepalense Wall. is an accepted species.
Ligustrum indicum is a synonym of Ligustrum sinense, but that does not include specimens found in India. The paper mentions that the species found in India are either Ligustrum nepalense Wall. or
Ligustrum confusum Decne. Ligustrum confusum Decne. is distributed in NE India, Nepal, Sikkim, Bhutan, Burma, China (Yunnan) and Thailand. The paper says: "To judge from notes with several of the specimens, this species often grows on stream and river banks." We found
it growing wild in Manipur, on a stream side. Looking at images on Flora of Bhutan and the illustration at FOC, I think the plant on FOI is Ligustrum confusum.