Strongly disagree with that statement. The method is very important to distinguish between the various art form. Both oil and water painings produce pictures, but the craft is entirely different, and so is the end result. Indeed, painting by numbers also produce a picture ( of sort); but thats hardly art.
To me, you need film to produce photographs. And film photographs is more desireable because its difficult to learn and execute ( propoerly anyways). Digital produces images.
Digital is for ease ( both learning and doing), and which suits commercial work - because its easily learnt and can be done by many ( and money, more than artistic merit, is the driver). And therefore does not have the exclusivity, which is a necessary ( but not sufficient )condition for desireable art.
All in my humble opinion, of course