Interesting that this carries a 1984 copyright date; the demo currently in circulation ("Yellow Sub Demo", which appears to be identical to this one) has a 1983 date on the Fuji screen.
Some internal mail from Atari's Vax servers in the Home Computer Division indicate that Paul Comfort was in "Component Test Engineering", and around this time (early February 1984) HCD was looking at an issue in the SALLY chip in A8 computers -- something to do with the data bus and the CLC (Clear Carry Flag) opcode failing in a high percentage of chips when operated at high temperatures. I know very little about 6502 programming but I gather that the CLC opcode *does* get used in some sprite positioning routines. I'm gonna guess that this demo wasn't related to that specific issue (I'm not even sure if the 5200 used the same SALLY revision that was being tested at the time), but it seems like the kind of quick-n-dirty cart that a test group might put together to put an IC through specific paces.
Thanks for sharing this with the community!