This is one of those stories that I am sure has happened, but when it comes to "and then they never asked him again le XD face" it's clearly just made up.
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2. It’s a direct recollection from someone who was there, not an unnamed “my cousin’s best friend” or literal folklore that is passed down by oral tradition. Andy knew Bill and was there. There is no clear motivation to tell a fictional story when there were so many real ones.
3. The specifics line up very well with what we know about Bill Atkinson and some his wizardry needed to make the Mac work.
Given this, it’s much easier to assume that your assertion is what is made up.