No. It's not a matter of "becoming" NT as opposed to "previously being autistic."
You can learn to adapt, but if you're truly autistic, the adaptation takes on going effort, some elements of "faking it," and though you may actually overcome certain traits, at your core, within your "being," you are still autistic.
In fact, over time, the effort of adapting can wear you out, even to the point of total burn out if you don't learn to take the necessary time outs from it all to just shut it all out, and be yourself, without all the superfluous external "stuff" that may make you appear "too normal" for others to accept that you are who you are. A more skilled autistic than you once were.
That burn out can look like, and is sometimes seen as regression. The truth is, it was always there. Many of us just learn how to hide it, but it never really goes away.
_________________
I'm not likely to be around much longer. As before when I first signed up here years ago, I'm finding that after a long hiatus, and after only a few days back on here, I'm spending way too much time here again already. So I'm requesting my account be locked, banned or whatever. It's just time. Until then, well, I dunno...