Other possibilities:
1. His autism affects him in ways different than yours does you
2. He has been able to learn compensatory strategies that he effectively executes
3. He is making social errors that others find charming and you are not picking up on
4. His deficits are less obvious
I will admit this is a sensitive topic for me. Both of my kids can appear quite typical on the surface. But if you know them well, then you know how hard they have to work to keep up that appearance. No NT person has to work that hard to appear typical. And when their ability to compensate fails, they fall very hard and often get little understanding from others, who have not realized that they are working to overcome social deficits and that what they generally see is the result of effort, not innate ability.
I guess what I am saying is looks can be deceiving. It doesn't sound like you know him well, or for very long. It may be that he is just very comfortable at work and knows the scripts well so it gives him the appearance of natural capacity that he doesn't really have. I myself, a rather well-rooted introvert with some social awkwardness, can appear quite extroverted and socially adept in some circumstances. It is no more than acting, however. I have a script and I carry it out. The keen eye will see it though, because my "script" stays the same, even if the situation changes and it is hard for me to improvise. Social gatherings, even though I can usually handle them successfully, are exhausting and a lot of work. But people who only know me casually may not be aware of that.
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Mom to 2 exceptional atypical kids
Long BAP lineage