Chameleon behavior has to do with mimicing others. This has to do with rote memorizing of social utterances, phrases, inflection, intonation and accents. Some people with autism can copy accents very well. I copy phrases. My language can change quite wildly.
Self-identity is hard one to understand. One of the problems in understanding this trait is that self-reflection in an autie (well, atleast myself) appears different than NT self-reflection. I am often told that I am insightful and very philosophical, both of which I doubt. This is because my self-reflection uses fuzzy logic as a coping mechanism to avoid rigid thinking in social situations. Certainly, I find reading a book of philosophy more inherent to how I think than reading an autobiography.cI have always thought that my thinking can be abnormally metacognitive which would appear philosophical. but I always have some doubts reading psychological literature that says autie's lack self-identity because it is written from a NT standpoint: possibly a person may not appear to have a strong identity, but in fact they may have one. I can be a very difficult person to read.
Self-identity also involves self-awareness. Certainly there are people with autism who struggle with self awareness - such as a detachment from their emotions (not knowing how they feel, not presenting what they feel), a 'detachment' from their senses (clumsiness, lack of feeling) and a detachment from thought processes. I can quite often come to a conclusion or an answer to a problem without ever thinking about it. "Show your work" in math class was pointless for me because it involved writing down the answer and then working backwards. Not reciprocating emotions to a NT person can be interpreted as being "depersonal" - something I saw a lot of in my college days
I wouldn't trust me though, I probably read this all somewhere else.
I'll trust you in this, it all seems plausible and resonates with me.