story
That probably is part of the problem here.
For starters, you could try looking into Jeffrey Shaw & Gideon May.
Netochka Nezvanova is another name that springs to mind (but that likely will not qualify by some of your criteria), the Electronic Disturbance Theater is another.
There are probably 100's if not 1000's of artists that have chosen to use the computer as their medium of choice, usually they don't make the code central to the expression because the code is the vehicle.
But there are definitely artists that craft with the code as their central means of expression.
I feel that by first stating something overbroad and now redefining it in a way that is overly narrow to then be able to say that 'see, nobody fits the exact same niche' is a bit of a cheap trick, after all, _why was just _why, unique, like every other artist. So no, if you keep on adding conditions why nobody was like him or even crafting 'art' you can easily exclude the rest of the world and maintain your claim. But that's a pretty limiting act and it seems like a very technical way to win the argument.
_why was neither the first, the last or particularly special in what he did unless you mean special to be used as 'specific' rather than as a claim to quality. He successfully promoted himself, his art and incidentally the ruby language. But that does not warrant such overbroad claims as were made above.