Sounds like the author knows, but for those unaware, the first SGB ran at the wrong speed and has no link cable port. Japan got a Super Game Boy 2 that runs at the proper speed and does have a link cable port. You can pick one up on eBay and use it with your SNES if you modify the plastic around the inside of the cartridge slot to fit SFC games. You can also just take the top off and it'll fit.
I recommend picking up a fiberglass pen if you get a Super Game Boy 2 or other SNES/SFC games. Often the pins are pretty dirty and the games will only work one out of every few inserts, if at all. Give them a good rubbing with the pen, quick clean with isopropyl alcohol to get rid of the dust, and you can get them working totally reliably. Works on GB/GBC/GBA games as well.