If it's green, it just means the colors have degraded a lot after all these years.
I think it applies to more VFD games, but it's very hard to tell which ones were originally yellow, when all video references are relatively recent. It doesn't help when games have touched-up photos on the box. Tomy Tron's box art has yellow instead of green for example, but does not look like an untampered VFD photo. Or even fake VFDs in commercials, like Epoch Dracula here:
