It's up to you to present bitcoin in any way possible based on your background, bitcoin is still bitcoin. The way you use it is art, the way you store PK in various forms of media is art, and the way scammers steal people's bitcoins is also art.
But the only real and logical explanation is that it was created by an artist.
Satoshi isn't an artist.
You don't have one single argument to prove your assumption. Review Bitcoin's original logo design. Graphic design is art.