Earlier quoted context omitted.
I'm the original author, and I agree with your point. I do think the things you produce are part of your identity. It's when a person mentally replaces "part of" with "is" that it becomes dangerous. We can be so much more than the artifacts we create.
One thing you didn't mention in your article, but which I think is a relevant and interesting observation to make, is that 'your code =/= your identity' works both ways. It's not just that you should not project messy code onto someone's personality/identity, but you also cannot reliably do the inverse. I know people who are meticulously organized in everything they do in real life, who hate to be around a mess, who…
You'd consider those to be shortcomings? I'd consider them to be strengths. Granted, you can take those strengths too far such that they become weaknesses. But as long as you're careful not to turn them into a Golden Hammer, I wouldn't count those as weaknesses.