Seriously fascinating, thank you for sharing.
I had taken a skeptical gaze at the article, not because I professionally study the subject, but because this particular area of science has recently come under fire for issues of researches attempting to reproduce results and discovering some of the "Really Surprising Results" turned out to just be wrong. And the source is a "General News Provider"[0].
I am not autistic. I know a lot of study is being put to understanding that condition, better, but I wonder -- along those lines, do they study the differences, or the edges of those differences: As an explanation, I'm pretty consistent/quick with emotional response but I just read you nearly tell a stage fright story I have related to my children. I used to do community theater, but ended up getting a paid, roll in a play at age 13 that got me out of two months of school.
Dress rehearsal I had a bit of an anxiety attack; one of the women in the show came to check on me and said something along the lines of "how exciting this is". And that was it, anxiety turned excitement. I'd sort of taken for granted that I probably "just changed my way of thinking about the experience". After all, what I was nervous about didn't go away -- I was nervous I would fail in front of a large audience who just spent more than I could afford for a ticket to this thing. I was excited about succeeding but that wasn't a guarantee.
I think I was wrong about that; I think it happened a lot more like you describe: I remember hearing "exciting" and feeling an instant change because I had recognized that what I thought I was experiencing: overwhelming anxiety, was not what I was really feeling: overwhelming excitement and almost no stage fright[1]. The next time it happened was a lead (singing) part in a high school production in front of my peers, with a lot of the school year left[2], but this time it was exactly one heart-beat long, immediately replaced with excitement, just before I walked on stage.
[0] See "Gell-Mann Amnesia effect"
[1] I was a shy kid; I think my parents recognized that, along with the fact that during my childhood, girls almost always played boy parts due to not a single boy showing up for an audition. My first part was because I was dragged along to something my sister auditioned for (and failed to get the part). I think I was too young to understand fear of embarrassment, and did that so frequently in my childhood that it never really formed outside of minor nerves and this incident.
[2] Our school, I was surprised to learn, was unique for a run-of-the-mill suburban public high school theater. Two shows a year, one musical, different every time, sold out by the end of the day the first day tickets are offered (no shows during school hours). Head of English department (also Director) disallowed "extra credit" b/c of the theater size which really made looking at a packed with "Standing Room Only" tickets sold out, attended by a bunch of "not the good kids", all shifting their weight, standing, while laughing at something written by Shakespeare, performed in home-made costumes/set by high school kids.