For another -- why would they foreshadow that in a VOY book, of all things?
Why would they kill Janeway off in a TNG book of all things?
Mostly because the VOY line had stalled out at that point, and the VOY characters, when they were appearing, were appearing as "guest stars" in other series' books. And that one, quite appropriately, featured Janeway, Seven, and the Borg.
But the TOS and the generic ST lines haven't stalled, so there's no reason for Kirk to be resurrected in a VOY novel.
It's just someone else quoting Schwartz, that's all.