I see what you’re saying but I also think that it is a legitimate statement. I have interest in building analog synthesizer gear and efx pedals. I’ve built a few circuits on breadboards but I am not an electrical engineer or synthesizer designer. The statement is likely just a way to say excuse the mess/possibility of bad practice in my implementation.
Oh, I totally was not questioning the legitimacy of the statement - most of my work is not in service of producing software that is sold. My work is instead a mess of bad practice to just get something accomplished for others.
More generally speaking, I wish more people were like this creator - unafraid to just dive in and get stuff done. I have done a little bit of teaching introductory programming and one of the things I emphasized is that "works but is suboptimal along some professional measure" mostly rounds to "works" even in professional settings.
Part of my actual day job is working with non-professional software developers and helping take "non-professional" prototypes to "better" implementations. Having a working prototype is often a much better starting point that a poorly specified set of requirements . . .