Ah, thanks for the link.
The message was discovered embedded in the ROMs for the European PAL version of the Amiga 1000, just after the computer had gone on sale in the United Kingdom. Managers at Commodore UK pulled tens of thousands of Amigas off the shelves and refused to sell the machines until replacement ROM chips were sent
but.... but... but...
The Amiga 1000 didn't have a ROM chip!
Which sorta shoots this story down.
It was certainly there in my Amiga 500 with 1.2
Reading the ars story again, it's fairly obvious where the main research for the article in RG was done!