I mostly agree with it.
The thing is till mid 50s, Tawang wasn't integrated with what we now call Aruanchal, while most parts of present day Aruanchal was directly administered by the Governor of Assam. For instance, the town of Pasighat is 100 years old.
The Chinese took the wrong way to lay their claim on Arunachal. The war did nothing but drove the Aruanchalis into the Indian fold. It is true that at first the Chinese were rather good to the people but occupation forces are seldom cruel to the people of occupied lands in the initial phases.
In Arunachal, the people of tawang region, more than anyone else vehemently oppose the chinese claim as they see China as an aggressor which has occupied Tibet by deceit and force. They also oppose the very personal attacks by the Chinese govt and media on the dalai lama as he is also religious head of the Monpas. Arunachal today is the most pro-indian state in north east (even more than majority hindu assam which has racial affinity with rest of india as well)) india with no militant movement of indigenous people seeking separation from India.
BTW, i see the article as seen through the eyes of an Assamese and not an Arunachali.