They did remove the atc, programmed it and soldered it back on, looks like they didn't have a test clip for easy programming.
But yes you can reflash it. I like .5... instead of .5..3
They plugged the 5$ card into a PC, started the NEC supplied programming tool, changed the subsystem ID, removed the card and put the yellow sticker on.
The ATC chip can be reprogrammed by PCI accesses over the NEC chip. No need to start soldering. NEC provides all necessary information to registered users of their webpage.
Just to mention it: Spider won't work on AOS4.x Classic. The Mediator does not allow real DMA (just PCI-PCI DMA between PCI cards, not to Amiga motherboard), and as the NEC chip (as pure PCI solution) can only operate on DMA, you're done.
DENEB can at least be operated in Zorro III PIO mode with Poseidon running under M68k emulation on AOS4.x classic.
Michael