I just don't see how a novel about Geordi is somehow not a "legitimate" TNG novel just because it doesn't fit into someone else's idea about what a TNG novel ought to be about.
By that logic, every Titan
novel is a TNG novel as well. It would also make IFM as much a TOS novel as a TNG one.
When I read a Star Trek
novel, I want to read about the people I've been watching on TV all these years. Not one here and one there.
So shoot me...
Heck, they've fractured DS9 so much that David George had to go through all kinds of gymnastics to get them back together for a 20th anniversary novel.