On a quick look, I'm coming up with the story that Musk's programming, back when he did it, was long and multi-purposed, rather than concise and focused. It would hardly be unthinkable for a guy like Musk to quietly consider that to be the better way to handle things and favor others who did so. With that said, I didn't see any specific corroboration on a quick search.
I found this
“They took one look at Zip2’s code and began rewriting the vast majority of the software. Musk bristled at some of their changes, but the computer scientists needed just a fraction of the lines of code that Musk used to get their jobs done. They had a knack for dividing software projects into chunks that could be altered and refined whereas Musk fell into the classic self-taught coder trap of writing what developers call hairballs—big, monolithic hunks of code that could go berserk for mysterious reasons.”
― Ashlee Vance, Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future
Which corroborates your first point, if not the subsequent speculation.
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