This isn't a "zero day", it's a trojan horse. The author, given his position, ought to know the difference, so what's the reason for using the wrong term? Also

This isn't a "zero day", it's a trojan horse. The author, given his position, ought to know the difference, so what's the reason for using the wrong term? Also bears pointing out that all of the behavior (along with the attack vector) was prompted-in by the researcher rather than the GPT.