This was quoted in the Fall 1989 edition of the Keystone Folklore Archives. It also appears somewhat earlier in the 1984 edition of Keystone Folklore, identified as being on page 26 in "Volumes 2-4" whatever that means.
It's worthy of note that they've identified it not as their own quote, but rather something that button-makers had been putting onto pin and buttons sold at scifi fairs for several years prior.
“Reality is a Crutch for People Who Can’t Deal With Science Fiction:”
Fans intend for buttons of this land to invite comment. Comments can
come in the form of talk, and often do, but since buttons can be
obtained quickly at science fiction conventions, comments on buttons
can also come in the form of alternative buttons. Some of these
running button dialogues have been preserved and extended beyond their
originators by their inclusion in button catalogs. For example, a
statement by science fiction author, Arthur C. Clark, became a button:
“Any sufficiently advanced technology is indistinguishable from
magic.” This, in turn, inspired a series of fan-composed corollary
- Any sufficiently advanced magic is indistinguishable from technology
- Any sufficiently advanced technology is indistinguishable from a rigged demo.